GRB 211023A
GCN Circular 31596
Subject
GRB 211023A: evidence of supernova in LBT spectra
Date
2022-02-16T08:49:19Z (4 years ago)
From
Andrea Rossi at INAF <andrea.rossi@inaf.it>
A. Rossi, E. Pian, E. Palazzi (INAF-OAS), A. Melandri (INAF-OAB), on
behalf of the CIBO collaboration, B. Rothberg (LBTO/GMU), A. Pozanenko,
S. Belkin (IKI), and D. A. Kann (HETH/IAA-CSIC) report :
We report the results of the photometric and spectroscopic follow-up
observations of GRB 211023A (Fermi GBM team, GCN 30958; Di Lalla et al.,
GCN 30961; Lesage et al, GCN 30965; Ursi et al, GCN 30969; Poolakkil,
GCN 30998; Ridnaia et al., GCN 31022) at z = 0.390 (Pozanenko et al.,
GCN 31053) obtained with the Multi-Object Double Spectrographs (MODS)
instrument mounted on the 2x8.4-m LBT telescope (Mt. Graham, AZ, USA).
Data were obtained at ~12 UT on 2021-11-05, ~13 days (i.e. 9 rest-frame
days) after the burst trigger.
Spectroscopy of the source was obtained for a total of 4x900 s, covering
the wavelength range 3200-10000 AA. The spectrum has been corrected for
Galactic extinction (A_V = 0.45 mag). The contribution of the host
galaxy was removed via a galaxy template matching the emission line
fluxes. The low S/N spectrum shows features similar to those exhibited
by XRF-associated SN2006aj at a similar phase (Mazzali et al. 2006,
Nature, 442, 1018). This confirms the bump observed by Belkin et al.
(GCN 31098), as due to the emerging contribution of the SN.
We acknowledge the excellent support from the LBTO in particular O. Kuhn
and S. Allanson, and from the LBT-INAF staff, particularly F. Cusano, S.
Paiano, and E. Marini in obtaining these observations.
GCN Circular 31134
Subject
GRB 211023A: Xinglong 2.16m optical observations
Date
2021-11-29T05:33:13Z (4 years ago)
From
Liping Xin at NAOC, SVOM <xlp@nao.cas.cn>
L. P. Xin (NAOC), J. Wang(GXU), C. Gao(GXU), Y. L. Qiu(NAOC),
J. Y. Wei(NAOC), B. Ren(GXU), L. H. Li (NAOC), C. Wu(NAOC),
E. W. Liang(GXU), X. H. Han (NAOC) and J. S. Deng(NAOC) report:
We observed the field of the GRB 211023A (Fermi GBM team, GCN 30958; Di
Lalla et al., GCN 30961; Lesage et al, GCN 30965; Ursi et al, GCN 30969;
Poolakkil, GCN 30998; Ridnaia et al., GCN 31022 )
with 2.16m optical telescope at Xinglong observatory, China.
Ten images in R band were obtained from 2021-11-12T16:46:10 UT to
2021-11-12T17:32:18 UT, about 20.16 days after the burst.
The exposure time for each image was 300 sec.
The optical counterpart (Lipunov et al., GCN 30970; Zhirkov et al, GCN 30977;
Kann et al, GCN 30982; Hu et al, GCN 30990; Belkin et al, GCN 31004; Vinko et al, GCN
31008; Belkin et al, GCN 31018; Belkin et al, GCN 31020; Kumar et al,
GCN 31023; Gupta et al., GCN 31041; Strobl et al., GCN 31042; Pozanenko
et al., GCN 31053; Moskvitin et al., GCN 31066, , Belkin et al., GCN 31098)
was clearly detected in our the stacked image with a brightness of 22.0 magnitude
in R-band. The photometry was calibrated with several nearby USNO B1.0 catalogs.
GCN Circular 31133
Subject
GRB 211023A: Xinglong 2.16m optical observations
Date
2021-11-29T05:06:21Z (4 years ago)
From
Liping Xin at NAOC, SVOM <xlp@nao.cas.cn>
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GCN Circular 31098
Subject
GRB 211023A: optical observations and photometric evidence of supernova
Date
2021-11-20T14:54:34Z (4 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
S. Belkin (IKI), A. Pozanenko (IKI), I. Sokolov (INASAN, KIAM), E.
Klunko (ISTP), A. S. Moskvitin (SAO RAS), V. Kim (HSE, FAI), V.
Rumyantsev (CrAO), R. Ya. Inasaridze (AbAO), M. Krugov (FAI), D.
Berezin (IC AMER NASU), G. Butenko (IC AMER NASU), N. Pankov (HSE), D.
Datashvili (AbAO), V. R. Ayvazian (AbAO), G. V. Kapanadze (AbAO) report
on behalf of GRB IKI FuN:
We observed the field of the GRB 211023A (Fermi GBM team, GCN 30958; Di
Lalla et al., GCN 30961; Lesage et al, GCN 30965; Ursi et al, GCN 30969;
Poolakkil, GCN 30998; Ridnaia et al., GCN 31022) with Zeiss-2000 and
Zeiss-600 telescopes of Terskol observatory, AZT-33IK telescope of Sayan
observatory (Mondy), AZT-20 telescope of Assy-Turgen observatory, ZTSh
2.6m-telescope of CrAO observatory, AS-32 telescope of AbAO observatory,
and Zeiss-1000 1-m telescope of SAO RAS. The optical counterpart
(Lipunov et al., GCN 30970; Zhirkov et al, GCN 30977; Kann et al, GCN
30982; Hu et al, GCN 30990; Belkin et al, GCN 31004; Vinko et al, GCN
31008; Belkin et al, GCN 31018; Belkin et al, GCN 31020; Kumar et al,
GCN 31023; Gupta et al., GCN 31041; Strobl et al., GCN 31042; Pozanenko
et al., GCN 31053; Moskvitin et al., GCN 31066) was detected in most of
the stacked images. A preliminary light curve based on our observations
and GCN Circulars cited above can cab be found at
http://grb.rssi.ru/GRB211023A/GRB211023A_LC.png
Starting from the fifth day, a systematic flux excess over the
approximation of the afterglow by a single power law is observed. After
subtraction of the afterglow approximated by the light curve with
a power law (Belkin et al, GCN 31020), and neglecting a contribution of
the host galaxy we determine a preliminary light curve of possible SN, see
http://grb.rssi.ru/GRB211023A/GRB211023A_AG_subtracted_LC.png
Using redshift of GRB 211023A (Pozanenko et al., GCN 31053)
we calculated an absolute magnitude at the maximum of the supposed
supernova (M_R=-19.9 +0.40 -0.29; adjusted by a Galactic extinction
(Schlafly & Finkbeiner, 2011)) and a time since the burst trigger in
the observer frame (t-T0 = 16.9+/-1.5). These parameters are in
agreement with parameters of known SN-GRB (e.g. see Figure 12 from
Belkin et al., Astronomy Letters, 2020). The supernova associated with
GRB 211012A is in agreement with early predictions (Kann et al, GCN
30982; Aimuratov et al., GCN 31056; Minaev et al., GCN 31081).
GCN Circular 31081
Subject
GRB 211023A: classification and SPI-ACS/INTEGRAL registration
Date
2021-11-13T19:43:24Z (4 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
P. Minaev (IKI), A. Pozanenko (IKI), S. Grebenev (IKI), I. Chelovekov
(IKI) report on behalf of GRB IKI FuN
We analyzed GRB 211023A (Di Lalla et al. GCN 30961; Lesage et al. GCN
30965; Ursi et al. GCN 30969; Ridnaia et al. GCN 31022) using publicly
available data of GBM/Fermi and SPI-ACS/INTEGRAL.
Using GBM/Fermi we clearly detect early emission, starting about 80 s
before the GBM trigger. The extended emission (possibly associated with
the activity detected by LAT, Di Lalla et al. GCN 30961, and/or its
extremely bright afterglow, Zhirkov et al. GCN 30977; Kann et al. GCN
30982) was also found, becoming dominant since approximately 150 s the
trigger. Thus, a time profile consists of three episodes with a total
burst duration of more than 300 s in GBM/Fermi (7 - 850 keV), while T90
= 117 +/- 0.5 s. GRB 211023A was also registered by SPI-ACS/INTEGRAL
with marginal detection of the early and the extended emission (T90 =
120 +/- 9 s). Time profiles of GBM and SPI-ACS are presented at
http://grb.rssi.ru/GRB211023A/GRB211023A_GBM_ACS_light_curve.png
We performed spectral analysis of the burst using GBM/Fermi data in the
time interval of (-20, 160) s after the GBM trigger, covering the main
part of GRB activity. The best parameters of Band model are following:
Ep = 96 +/- 5 keV, alpha = -1.67 +/- 0.03, beta = -2.21 +/- 0.05 and
fluence F = (1.341 +/- 0.004)*10^-4 erg/cm^2 in 10 - 1000 keV range.
Assuming a redshift z = 0.390 (Pozanenko et al., GCN 31053) we estimated
Eiso = (7.45 +/- 0.05)*10^52 erg in the 1 keV - 10 MeV energy band.
The position of the burst at Ep,i - Eiso and T90,i - EH diagram [1,2] is
shown by black annuli at
http://grb.rssi.ru/GRB211023A/GRB211023A_Ep-Eiso_two_episodes_SN.png
and
http://grb.rssi.ru/GRB211023A/GRB211023A_EHD_two_episoses_SN.png
The position is typical for type II (long) GRBs, although it is in the
lower bound of their 2 sigma correlation region. This is because of its
relatively low value of the Ep,i parameter. Note that low values of Ep,i
are typical for the nearby bursts (z < 0.5), associated with supernovae
(shown by red annuli at
http://grb.rssi.ru/GRB211023A/GRB211023A_Ep-Eiso_two_episodes_SN.png
and
http://grb.rssi.ru/GRB211023A/GRB211023A_EHD_two_episoses_SN.png )
[1] - Minaev et al., MNRAS, 492, 1919, 2020
[2] - Minaev et al., Astronomy Letters, 46, 9, 573, 2020
GCN Circular 31066
Subject
GRB 211023A: SAO RAS optical observations
Date
2021-11-09T17:32:28Z (4 years ago)
From
Moskvitin Alexander at SAO RAS <mosk@sao.ru>
A. S. Moskvitin and O. I. Spiridonova (SAO RAS),
on behalf of the GRB follow-up team report:
We observed the field of GRB 211023A (Fermi GBM team, GCN 30958,
Di Lalla et al. GCN 30961, Lesage et al. GCN 30965, Ursi et al.
GCN 30969, Poolakkil GCN 30998, Ridnaia et al., GCN 31022)
with the SAO RAS 1-m telescope Zeiss-1000 + CCD-photometer
on November 9. We obtained 6 x 300 sec. frames in Rc band
(00:25:41 -- 01:31:04 UT, T_mid-T0 = 16.4949 days) and 6 x 300 sec.
frames in Ic (00:31:28 -- 01:36:45 UT, T_mid-T0 = 16.4989 days).
The afterglow (Zhirkov et al. GCN 30977, Kann et al. GCN 30982,
Hu et al.GCN 30990, Belkin et al. GCN 31004, Vinko et al. GCN 31008,
Belkin et al. GCN 31018, Belkin et al. GCN 31020, Amit Kumar et al.
GCN 31023, Rahul Gupta et al. GCN 31041, Strobl et al. GCN 31042,
Pozanenko et al. GCN 31053) is clearly detected in our stacked frames
with the following brightness: R = 21.69 +/- 0.09, I = 21.27 +/- 0.14
(the preliminary photometry is based on nearby stars of PS1 catalogue,
gri -> R and I by Lupton 2005 transformations).
GCN Circular 31056
Subject
GRB 211023A: A BdHN of type I
Date
2021-11-08T19:17:11Z (4 years ago)
From
Remo Rufinni at ICRA <ruffini@icra.it>
Y. Aimuratov, L. Becerra, C.L. Bianco, Y-C. Chen, C. Cherubini, S.
Eslamzadeh, S. Filippi, M. Karlica, Liang Li, G.J. Mathews, R. Moradi,
M. Muccino, G.B, Pisani, F. Rastegar Nia, J.A. Rueda, R. Ruffini, N.
Sahakyan, Y. Wang, S.S. Xue, on behalf of the ICRANet and ICRA-USTC
team, report:
The identification of the redshift z=0.36 of GRB 211023A (A. Pozanenko
et al. 2021, GCN 31053), with the isotropic energy of Eiso~6x10^52 erg
in 10-1000 keV (S. Lesage et al. 2021, GCN 30965, S. Poolakkil et al.
2021, GCN 30998), qualify GRB 211023A as a BdHN I, confirmed by the
observation of the GeV emission (N. Di Lalla et al. 2021, GCN 30961),
originated from the black hole (R. Ruffini et al. 2019 ApJ 886 82,
Moradi et al 2021. Phys. Rev. D 104, 063043) and the afterglow emission
(Jan Strobl et al. 2021 GCN 31042) originated from the newborn neutron
star (J.A. Rueda et al. 2020 ApJ 893 148).
Following Ruffini et al. 2021 (MNRAS, 504, 5301,
doi:10.1093/mnras/stab724) we indicate the appearance of the peak of
optical supernova to be observed at (18.4+/-2.6) days after the trigger
(November 10th 2021, uncertainty from November 8th 2021 to November
12th 2021), with the bolometric optical luminosity of
L=(9.0+/-2.7)x10^42 erg/s.
The follow-up optical observations for the SN are recommended.
--
Prof. Remo Ruffini
APS Fellow
Google Fellow
Director of ICRANet
Piazza della Repubblica 10
65122 Pescara (PE) Italy
mobile: +39 339 4752566
Tel. Rome +39 06 49914304
Tel. Pescara +39 085 23054201
Fax: +39 085 4219252
e-mail: ruffini@icra.it
GCN Circular 31053
Subject
GRB 211023A: BTA spectroscopic redshift
Date
2021-11-08T15:16:33Z (4 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
A. Pozanenko (IKI), A. Moiseev (SAO RAS), A. Moskvitin (SAO RAS), E.
Malygin (SAO RAS), S. Belkin (IKI, HSE), N. Pankov (IKI, HSE), V. Kim
(HSE, FAI) on behalf of GRB IKI FuN, A. Rossi (INAF-OAS), D. A. Kann
(HETH/IAA-CSIC) report:
We observed the afterglow of GRB 211023A (Zhirkov et al, GCN 30977, see
also Kann et al, GCN 30982; Hu et al, GCN 30990; Belkin et al, GCN
31004; Vinko et al, GCN 31008; Belkin et al, GCN 31018; Belkin et al,
GCN 31020; Kumar et al, GCN 31023; Gupta et al., GCN 31041; Strobl et
al., GCN 31042) with BTA SAO RAS telescope equipped with SCORPIO-2
(VPHG940@600 grism). A total of 7200 s (6x1200 s) of spectra were
obtained starting on 21-11-05 (UT) 20:50:00, i.e. approximately 13.3016
days after burst. The afterglow is well detected in the acquisition
imaging with R = 21.61 +/- 0.04 (3 x 90 sec. 21-11-05 (UT) 20:43:59 --
20:50:58), and a continuum is visible across the bandwidth of a spectrum
4000 - 8500 A. The spectrum contain significant emission lines H_beta,
[OII] 3727, [OIII] 5007, at a common redshift of z=0.390. We assume
that the lines are from a host galaxy and, therefore, this is the
redshift of GRB 211023A. No evident lines of a possible SN were found.
Calibration of photometry is preliminary and based on nearby stars of
PS1 catalogue, gri -> R by Lupton transformations.
We are grateful to the directorate of SAO RAS for the TOO allocation.
GCN Circular 31042
Subject
GRB 211023A: optical detection by SBT in Ondrejov
Date
2021-11-05T07:08:47Z (4 years ago)
From
Martin Jelinek at Astro.Inst-AVCR,Ondrejov <martin.jelinek@asu.cas.cz>
Jan Strobl, Martin Jelinek, Rene Hudec, Cyril Polasek (ASU CAS Ondrejov, CZ)
We observed the optical afterglow of The Fermi/GBM/AGILE GRB 211023A (Fermi
GBM team, GCN 30958, Di Lalla et al. GCN 30961, Lesage et al. GCN 30965,
Ursi et al. GCN 30969, Poolakkil GCNC 30998) with the double 20cm
wide-field Small Binocular Telescope (SBT, cf. Strobl et al., AN
340,7,p.633, 2019) in Ondrejov observatory starting October 25 at 1:19 UT,
36.2h after the GRB detection. The afterglow (Vladimirov et al. GCN 30970,
Tiurina et al. GCN 30977, Kann et al. GCN 30982, Hu et al. GCN 30990,
Belkin et al. GCN 31004, Vinko et al. GCN 31008, Belkin et al. GCN 31018,
Belkin et al. GCN 31020, Ghosh et al. GCN 31023) is well detected in our
2x80x120s coadded exposure from both tubes:
Tmid-T0 Texp mag dmag filter
1.5706d 10762s 19.61 0.13 clear, calibrated as SDSS-r'(AB)
GCN Circular 31041
Subject
GRB 211023A: continued 1.3m DFOT Optical Observations and possible jet break
Date
2021-11-05T06:00:44Z (4 years ago)
From
Rahul Gupta at ARIES, India <rahulbhu.c157@gmail.com>
Rahul Gupta, S. B. Pandey, Amit Ror, Amit Kumar, Dimple, Ankur Ghosh, Amar
Aryan, Bhavya, and Kuntal Misra (ARIES) report:
We further observed the bright GRB 211023A (Fermi GBM Team 2021, GCN
30958; Lesage et al. 2021, GCN 30965; N. Di Lalla et al. 2021, GCN
30961; Ursi et al. 2021, GCN 30969; and Ridnaia et al. 2021, GCN
31022) with 1.3m Devasthal Fast Optical Telescope (DFOT) located at
Devasthal observatory of Aryabhatta Research Institute of
Observational Sciences (ARIES), India, starting on 2021-10-29 at
19:19:13 UT, i.e., ~ 6.26 days after the Fermi trigger. We obtained 24
and 18 frames having an exposure time of 300 sec in the R and I
filters, respectively. We detected the optical afterglow of GRB
211023A (Lipunov et al. 2021, GCN 30970; Zhirkov et al. 2021, GCN
30977; Kann et al. 2021, GCN 30982; Hu et al. 2021, GCN 30990; Belkin
et al. 2021, GCN 31004, 31018, 31020; Vinko et al. 2021, GCN 31008;
and Kumar et al. 2021, GCN 31023) in our stacked images of both the
filters. The preliminary photometric estimate of the afterglow in the
R filter is following :
Date Start UT T-T0 (mid, days) Filter Exp time (sec) Magnitude
=========================================================2021-10-29
19:19:13 ~6.28 R 300*24 22.58 +/- 0.33
Based on the preliminary photometry reported by using various
ground-based optical telescopes (Kann et al. 2021, GCN 30982; Hu et
al. 2021, GCN 30990; and Belkin et al. 2021, GCN 31004, 31018, 31020)
and our first epoch observations using 1.3m DFOT (Kumar et al. 2021,
GCN 31023), we measure the optical flux decay power-law index of the
afterglow light curve (Galactic extinction corrected) of GRB 211023A
equal to 1.49 +/- 0.04, consistent with those reported earlier (Belkin
et al. 2021, GCN 31004, 31020; and Vinko et al. 2021, GCN 31008).
However, we noticed that our second epoch observations are fainter
than the extrapolation of the early temporal decay index of ~1.5,
suggesting a possible break in the light curve. However, due to the
unavailability of near-simultaneous X-ray afterglow observations, we
could not confirm if this optical steeping is due to the jet break.
Further deeper and multiwavelength observations with larger telescopes
will be helpful to establish the possible jet break.
The reported magnitude value is not corrected for the Galactic
extinction in the direction of the burst. Photometric calibration is
performed using the standard stars from the USNO-B1.0 catalog.
This circular may be cited.
GCN Circular 31023
Subject
GRB 211023A: 1.3m DFOT Optical Observations
Date
2021-10-30T07:13:38Z (4 years ago)
From
Rahul Gupta at ARIES, India <rahulbhu.c157@gmail.com>
[image: image.gif]Amit Kumar, Rahul Gupta, Amit Ror, Dimple, Ankur Ghosh, Arpan
Ghosh, Amar Aryan, Brajesh Kumar, S. B. Pandey, and Kuntal Misra (ARIES)
report:
We observed the Fermi GBM and LAT detected GRB 211023A (Fermi GBM
Team, GCN 30958; Lesage et al. 2021, GCN 30965; and N. Di Lalla et al.
2021, GCN 30961) with 1.3m Devasthal Fast Optical Telescope (DFOT)
located at Devasthal observatory of Aryabhatta Research Institute of
Observational Sciences (ARIES), India. The observations were started
on 2021-10-28 at 19:22:54 UT, i.e., ~ 5.26 days after the Fermi
trigger. We have taken multiple frames having an exposure time of 300
sec in the R filter. We clearly detected the optical afterglow of GRB
211023A (Lipunov et al. 2021, GCN 30970; Zhirkov et al. 2021, GCN
30977; Kann et al. 2021, GCN 30982; Hu et al. 2021, GCN 30990; Belkin
et al. 2021, GCN 31004, 31018, 31020; and Vinko et al. 2021, GCN
31008) in our stacked image. The preliminary photometric estimate of
the afterglow is the following :
Date Start UT T-T0 (mid, days) Filter Exp time (sec) Magnitude
=========================================================
2021-10-28 19:22:54 ~5.28 R 300*15 21.37 +/- 0.08
Further observations are requested with 1.3m DFOT.The magnitude is not
corrected for the Galactic extinction in the direction of the burst.
Photometric calibration is performed using the standard stars from the
USNO-B1.0 catalog.
This circular may be cited.
GCN Circular 31022
Subject
Konus-Wind detection of GRB 211023A
Date
2021-10-28T21:24:26Z (4 years ago)
From
Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru>
A. Ridnaia, D. Frederiks, S. Golenetskii, A. Lysenko,
D. Svinkin, A. Tsvetkova, M. Ulanov, and T. Cline
on behalf of the Konus-Wind team, report:
The long-duration GRB 211023A (Fermi-GBM detection:
Fermi GBM Team, GCN 30958; Lesage et al., GCN 30965;
Fermi-LAT detection: Di Lalla et al., GCN 30961;
AGILE detection: Ursi et al., GCN 30969)
triggered Konus-Wind at T0=47199.142 s UT (13:06:39.142).
The burst light curve shows a multipeaked structure
started at ~T0-65.3 s with a total duration of ~207.9 s.
The emission is seen up to ~6 MeV.
The Konus-Wind light curve of this GRB is available at
http://www.ioffe.ru/LEA/GRBs/GRB211023_T47199/
As observed by Konus-Wind, the burst
had a fluence of 1.13(-0.04,+0.05)x10^-4 erg/cm2,
and a 64-ms peak flux, measured from T0+6.368 s,
of 5.12(-1.01,+1.01)x10^-6 erg/cm2/s
(both in the 20 keV - 10 MeV energy range).
The time-averaged spectrum of the burst
(measured from T0 to T0+103.936 s)
is best fit in the 20 keV - 6 MeV range
by a power law with exponential cutoff model:
dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep)
with alpha = -1.85(-0.03,+0.03)
and Ep = 122(-12,+15) keV (chi2 = 100/79 dof).
Fitting by a GRB (Band) model yields the same alpha and Ep,
and an upper limit on the high energy photon index: beta < -2.4
(chi2 = 99/78).
The spectrum near the maximum count rate
(measured from T0+5.888 to T0+10.496 s)
is best fit in the 20 keV - 6 MeV range
by a power law with exponential cutoff model
with alpha = -1.27(-0.06,+0.06)
and Ep = 267(-22,+27) keV (chi2 = 76/72 dof).
Fitting by a GRB (Band) model yields the same alpha and Ep,
and an upper limit on the high energy photon index: beta < -2.6
(chi2 = 75/71).
All the quoted errors are at the 90% confidence level.
All the quoted values are preliminary.
GCN Circular 31020
Subject
GRB 211023A: Terskol optical observations
Date
2021-10-28T18:01:05Z (4 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
S. Belkin (IKI, HSE), I. Sokolov (INASAN, KIAM), D. Berezin (IC AMER
NASU), A. Pozanenko (IKI), N. Pankov (IKI, HSE), G. Butenko (IC AMER
NASU) report on behalf of GRB IKI FuN:
We observed the GRB 211023A (Fermi GBM team, GCN 30958) with Zeiss-2000
telescope and Zeiss-600 telescope of Terskol observatory. The
afterglow of the GRB 211023A (Lipunov et al., GCN 30977; Kann et
al. GCN 30982; Hu et al. GCN 30990; Belkin et al., GCN 31004,31018) is
clearly detected with Zeiss-2000 and marginally detected with
Zeiss-600. Preliminary photometry of the afterglow is following.
Date UT start t-T0 Filter Exp. OT Err. UL. Telescope
(mid, days) (s)
2021-10-26 15:08:26 3.11542 R 29*180 20.59 0.16 21.8 Zeiss-2000
2021-10-28 01:06:22 4.51191 R 11*180 20.91 0.10 22.5 Zeiss-2000
2021-10-28 00:15:55 4.47895 R 39*60 20.80 0.40 20.7 Zeiss-600
The photometry is based on the nearby USNO-B1.0 stars
RA DEC R2
04:53:23.10336 +85:19:26.4720 14.09
04:52:47.26344 +85:22:52.1508 15.75
The updated light curve can be found in
http://grb.rssi.ru/GRB211023A/GRB211023A_LC.png
GCN Circular 31018
Subject
GRB 211023A: continued Mondy optical observations
Date
2021-10-28T13:05:00Z (4 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
S. Belkin (IKI), A. Pozanenko (IKI), E. Klunko (ISTP), N. Pankov (HSE),
report on behalf of GRB IKI FuN:
We observed the GRB 211023A (Fermi GBM team, GCN 30958) with AZT-33IK
telescope of Sayan observatory (Mondy) starting on 2021-10-26 (UT)
14:47:57. We obtained 17 images in R-filter. The afterglow of the GRB
211023A (Lipunov et al., GCN 30977; Kann et al. GCN 30982; Hu et
al. GCN 30990; Belkin et al., GCN 31004) is clearly detected.
Preliminary photometry of the afterglow in a stacked image is following
Date UT start t-T0 Filter Exp. OT Err. UL(3sigma)
(mid, days) (s)
2021-10-26 14:47:57 3.09182 R 30*120 20.57 0.06 22.7
The photometry is based on the nearby USNO-B1.0 stars
RA DEC R2
04:53:23.10336 +85:19:26.4720 14.09
04:52:47.26344 +85:22:52.1508 15.75
GCN Circular 31008
Subject
GRB211023A: optical afterglow detection from Konkoly Observatory
Date
2021-10-26T16:18:29Z (4 years ago)
From
Jozsef Vinko at Konkoly Observator <vinko@konkoly.hu>
J. Vinko, A. Pal, L. Kriskovics, R. Szakats, K. Vida, Zs. Szabo
(Konkoly Observatory, Hungary) report:
We observed the field of GRB211023A (Fermi GBM team, GCN 30958)
with the RC80 robotic telescope at Piszkesteto Station of Konkoly
Observatory on 2021 Oct 25 starting at 17:46:47 UT. A series of 5x300 sec.
frames were collected through Sloan r'- and i' bands. The optical afterglow
(Zhirkov et al., GCN #30977; Kann et al. GCN #30982; Hu et al. GCN #30990;
Belkin et al. GCN #31004)
was detected on the stacked frames with the following magnitudes, calibrated.
via nearby PS1 stars:
Date UT-middle t-T0(hr) Exp(s) r'(AB-mag) i'(AB-mag)
2021-10-25 18:07:19 53.03 5x300 20.104 +/- 0.089 19.634 +/- 0.081
We measure the flux decline power-law index as -1.43 +/- 0.03, in accord with.
Belkin et al. (GCN #31004).
GCN Circular 31004
Subject
GRB 211023A: Mondy optical observations
Date
2021-10-26T12:06:17Z (4 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
S. Belkin (IKI), A. Pozanenko (IKI), E. Klunko (ISTP), N. Pankov (HSE),
report on behalf of GRB IKI FuN:
We observed the GRB 211023A (Fermi GBM team, GCN 30958) with AZT-33IK
telescope of Sayan observatory (Mondy) starting on 2021-10-25 (UT)
15:16:32. We obtained 17 images in R-filter. The afterglow of the GRB
211023A (Lipunov et al., GCN 30977; Kann et al. GCN 30982; Hu et
al. GCN 30990) is clearly detected. Preliminary photometry of the
afterglow in a stacked image is following
Date UT start t-T0 Filter Exp. OT Err. UL(3sigma)
(mid, days) (s)
2021-10-25 15:16:32 2.10265 R 17*120 19.87 0.15 21.0
The photometry is based on the nearby USNO-B1.0 stars
RA DEC R2
04:53:23.10336 +85:19:26.4720 14.09
04:52:47.26344 +85:22:52.1508 15.75
Based on photometry reported early (Kann et al. GCN 30982; Hu et al.
GCN 30990) we can approximate a light curve of the afterglow as a power
law with the index of 1.49+/-0.03. See also the figure of the light curve in
http://grb.rssi.ru/GRB211023A/GRB211023A_LC.png
GCN Circular 30998
Subject
Correction to GCN 30965: GRB 211023A: Fermi GBM detection
Date
2021-10-25T19:46:21Z (4 years ago)
From
Suraj Poolakkil at UAH <sp0076@uah.edu>
S. Poolakkil (UAH) reports on behalf of the Fermi GBM Team:
"The Fermi Gamma-ray Burst Monitor (GBM) GCN circular for GRB 211023A (S.
Lesage et al. 2021, GCN 30965)
had the event fluence stated incorrectly. The event fluence (10-1000 keV)
for this trigger is
(1.114 +/- 0.007)E-04 erg/cm^2."
GCN Circular 30990
Subject
GRB 211023A: 1.5m OSN optical observation
Date
2021-10-25T13:24:27Z (4 years ago)
From
Youdong HU at IAA-CSIC <huyoudong072@hotmail.com>
Y.-D. Hu, V. Casanova, T.-R. Sun, A. J. Castro-Tirado, M. D. Caballero-Garcia, M. A. Castro Tirado and E. Fernandez-Garcia (IAA-CSIC), on behalf of a larger collaboration, report:
Following the detection of GRB 211023A by Fermi (GCN 30958) and AGILE (Ursi et al. GCNC 30969), images in BVRI bands were obtained at the 1.5m OSN telescope in Sierra Nevada Observatory (Granada, Spain) starting on 24 Oct 22:57 UT. In the first R-band 90 s exposure image, the optical afterglow discovered by MASTER (Zhirkov et al. GCNC 30977) and also reported at OAJ (Kann et al. GCNC 30982) is clearly detected, for which we measure R = 19.27 +/- 0.14 (~1.4 d after trigger). Further observations are ongoing.
We thank the staff at OSN for their excellent support.
GCN Circular 30982
Subject
GRB 211023A: OAJ Bright Afterglow Confirmation
Date
2021-10-25T00:45:45Z (4 years ago)
From
Alexander Kann at IAA-CSIC <kann@iaa.es>
D. A. Kann (HETH/IAA-CSIC), A. de Ugarte Postigo (HETH/DARK/NBI), C. C.
Thoene, M. Blazek, J. F. Agui Fernandez (all HETH/IAA-CSIC),
Iglesias-Marzoa, R., and Lacruz, E. (both OAJ) report:
We observed the Fermi-LAT position (Di Lalla et al., GCN #30961) of the
bright Fermi GRB 211023A (Fermi detection: Fermi GBM Team, GCN #30958;
Lesage et al., GCN #30965; AGILE detection: Ursi et al., GCN #30969)
with the JAST/T80 telescope of OAJ, Teruel, Spain. We obtained 3 x 300 s
images each in g', r', and i' under good conditions.
At the position of the MASTER afterglow candidate (Zhirkov et al., GCN
#30977), we detect a bright source which is not visible in Pan-STARRS
archival imaging. Against three Pan-STARRS comparison stars, we measure
r' = 18.03 +/- 0.02 mag (AB mag) at 0.5704 d after the GRB.
We note this is an exceedingly bright afterglow, just slightly fainter
at similar times than those of GRBs 130427A and 181201A. We also note a
resemblance in prompt emission shape, fluence (S. Poolakkil, priv.
comm.), and peak energy to the famous GRB 030329. Spectroscopic
observations and further follow-up are encouraged.
GCN Circular 30977
Subject
GRB 211023A: MASTER OT J045237.07+851925.2 - optical counterpart discovery
Date
2021-10-24T20:36:12Z (4 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
K.Zhirkov, V. Lipunov, E.Gorbovskoy, P.Balanutsa, A.Kuznetsov, O.Gress, G.Antipov, D. Vlasenko,
N.Tiurina, D.Zimnukhov, V.Senik,V.Topolev, A.Chasovnikov, E.Minkina, V.Grinshpun, D.Cheryasov (Lomonosov MSU,SAI,PhysicsDepartment),
R. Rebolo, M. Serra(The Instituto de Astrofisica de Canarias),
D. Buckley (South African Astronomical Observatory),
O.A. Gres, N.M. Budnev (Irkutsk State University, API),
R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico FelixAguilar OAFA),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity)
MASTER Global robotic net (MASTER-Net:http://observ.pereplet.ru Lipunov et al.,2010,Advances in Astronomy,2010,30L)
started inspect of the FERMI GRB 211023A ( Fermi GBM team, GCN 30958,ttrigger=13:05:43, Fermi LAT GCN 30961)
errorbox just after sunset at 2021-10-23 15:12:50 UT (Lipunov et al. GCN 30970).
MASTER OT J045237.07+851925.2 discovery
MASTER-Kislovodsk auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L )
discovered OT source - optical counterpart of this GRB
at (RA, Dec) = 04h 52m 37.07s +85d 19m 25.2s at 2021-10-23.65385 UT.
Fast changing OT unfiltered magnitude at one of first images is 15.6m (mlim=18.9).
There is no minor planet in MPC and any sources in VIZIER at this place.
We have reference image on 2017-01-28.75669 UT with unfiltered mlim=19.9m.
Deep images and possibly host galaxy spectral observations are required.
GCN Circular 30970
Subject
Fermi GRB 211023A: Global MASTER-Net observations report
Date
2021-10-24T11:00:15Z (4 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, F.Balakin,
V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva,
D.Kuvshinov, D. Cheryasov
(Lomonosov Moscow State University, SAI, Physics Department),
R. Podesta, C.Lopez, F. Podesta, C.Francile
(Observatorio Astronomico Felix Aguilar OAFA),
R. Rebolo, M. Serra
(The Instituto de Astrofisica de Canarias),
D. Buckley
(South African Astronomical Observatory),
O.A. Gres, N.M. Budnev, O.Ershova
(Irkutsk State University, API),
A. Tlatov, D. Dormidontov
(Kislovodsk Solar Station of the Pulkovo Observatory),
V. Yurkov, A. Gabovich, Yu. Sergienko
(Blagoveschensk Educational State University)
MASTER-Kislovodsk robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB 211023A ( Fermi GBM team, GCN 30958) errorbox 7595 sec after notice time and 7627 sec after trigger time at 2021-10-23 15:12:50 UT, with upper limit up to 18.9 mag. Observations started at twilight. The observations began at zenith distance = 53 deg. The sun altitude is -11.0 deg.
The galactic latitude b = 24 deg., longitude l = 131 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=1762531
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
7657 | 2021-10-23 15:12:50 | MASTER-Kislovodsk | (04h 49m 25.33s , +80d 59m 06.4s) | C | 60 | 17.6 |
7657 | 2021-10-23 15:12:50 | MASTER-Kislovodsk | (05h 14m 59.29s , +80d 31m 48.1s) | C | 60 | 18.0 |
7737 | 2021-10-23 15:14:10 | MASTER-Kislovodsk | (06h 05m 53.66s , +82d 52m 16.2s) | C | 60 | 17.6 |
7738 | 2021-10-23 15:14:10 | MASTER-Kislovodsk | (06h 38m 00.47s , +82d 24m 21.4s) | C | 60 | 18.1 |
7818 | 2021-10-23 15:15:30 | MASTER-Kislovodsk | (04h 03m 55.16s , +82d 55m 29.7s) | C | 60 | 17.6 |
7818 | 2021-10-23 15:15:30 | MASTER-Kislovodsk | (04h 35m 48.63s , +82d 26m 44.7s) | C | 60 | 18.3 |
7898 | 2021-10-23 15:16:50 | MASTER-Kislovodsk | (06h 14m 35.51s , +84d 16m 43.5s) | C | 60 | 18.5 |
7978 | 2021-10-23 15:18:11 | MASTER-Kislovodsk | (06h 26m 03.45s , +80d 59m 05.9s) | C | 60 | 17.8 |
8739 | 2021-10-23 15:30:52 | MASTER-Kislovodsk | (04h 49m 49.99s , +81d 01m 17.2s) | C | 60 | 17.9 |
8739 | 2021-10-23 15:30:52 | MASTER-Kislovodsk | (05h 15m 18.70s , +80d 34m 03.5s) | C | 60 | 18.9 |
8820 | 2021-10-23 15:32:12 | MASTER-Kislovodsk | (06h 06m 13.17s , +82d 53m 02.8s) | C | 60 | 17.9 |
8820 | 2021-10-23 15:32:12 | MASTER-Kislovodsk | (06h 38m 08.10s , +82d 25m 14.9s) | C | 60 | 18.8 |
8900 | 2021-10-23 15:33:32 | MASTER-Kislovodsk | (04h 04m 13.51s , +82d 56m 18.7s) | C | 60 | 18.1 |
8900 | 2021-10-23 15:33:32 | MASTER-Kislovodsk | (04h 35m 54.56s , +82d 27m 46.4s) | C | 60 | 18.9 |
8980 | 2021-10-23 15:34:52 | MASTER-Kislovodsk | (05h 32m 37.45s , +84d 47m 34.5s) | C | 60 | 18.1 |
8980 | 2021-10-23 15:34:52 | MASTER-Kislovodsk | (06h 14m 59.02s , +84d 17m 59.9s) | C | 60 | 18.9 |
9060 | 2021-10-23 15:36:13 | MASTER-Kislovodsk | (06h 26m 19.59s , +80d 57m 45.3s) | C | 60 | 18.2 |
9822 | 2021-10-23 15:48:54 | MASTER-Kislovodsk | (04h 49m 45.52s , +80d 59m 47.8s) | C | 60 | 17.9 |
9822 | 2021-10-23 15:48:54 | MASTER-Kislovodsk | (05h 15m 14.78s , +80d 32m 34.9s) | C | 60 | 18.8 |
10503 | 2021-10-23 16:00:16 | MASTER-Kislovodsk | (06h 08m 19.72s , +82d 54m 05.0s) | C | 60 | 18.0 |
10503 | 2021-10-23 16:00:16 | MASTER-Kislovodsk | (06h 38m 33.51s , +82d 25m 32.3s) | C | 60 | 18.8 |
10583 | 2021-10-23 16:01:36 | MASTER-Kislovodsk | (04h 06m 04.03s , +82d 55m 51.3s) | C | 60 | 18.0 |
10583 | 2021-10-23 16:01:36 | MASTER-Kislovodsk | (04h 35m 57.28s , +82d 27m 01.3s) | C | 60 | 18.9 |
10664 | 2021-10-23 16:02:56 | MASTER-Kislovodsk | (05h 35m 10.07s , +84d 49m 07.8s) | C | 60 | 18.1 |
10664 | 2021-10-23 16:02:56 | MASTER-Kislovodsk | (06h 15m 13.89s , +84d 18m 52.0s) | C | 60 | 18.9 |
10744 | 2021-10-23 16:04:16 | MASTER-Kislovodsk | (06h 27m 59.93s , +80d 59m 13.0s) | C | 60 | 18.1 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.
GCN Circular 30969
Subject
GRB 211023A: AGILE detection
Date
2021-10-24T09:42:45Z (4 years ago)
From
Alessandro Ursi at INAF/IAPS <alessandro.ursi@gmail.com>
A. Ursi, M. Cardillo (INAF/IAPS), M. Tavani (INAF/IAPS, and Univ. Roma Tor
Vergata), A. Argan, C. Casentini, Y. Evangelista, E. Menegoni, L. Foffano,
G. Piano (INAF/IAPS), F. Lucarelli, C. Pittori, F. Verrecchia (SSDC, and
INAF/OAR), A. Bulgarelli, A. Di Piano, V. Fioretti, F. Fuschino, N.
Parmiggiani (INAF/OAS-Bologna), M. Marisaldi (INAF/OAS-Bologna, and Bergen
University), M. Pilia, A. Trois (INAF/OA-Cagliari), I. Donnarumma (ASI), F.
Longo (Univ. Trieste and INFN Trieste), A. Giuliani (INAF/IASF-Mi), report
on behalf of the AGILE Team:
The AGILE satellite detected the long GRB 211023A at T0 = 2021-10-23
13:07:58 s (UTC), reported by Fermi GBM (GCNs #30958, #30965) and Fermi LAT
(GCN #30961).
The burst is clearly visible in the AGILE scientific ratemeters of the
SuperAGILE (SA; 20-60 keV), MiniCALorimeter (MCAL; 0.4-100 MeV), and
AntiCoincidence (AC; 50-200 keV) detectors. The event lasted about 45 s and
it released a total number of 5300 counts in the SA detector (above a
background rate of 90 Hz), 64325 counts in the MCAL detector (above a
background rate of 1200 Hz), and 233020 counts in the AC detector (above a
background rate of 2810 Hz). The AGILE ratemeter light curves can be found
at http://www.agilescienceapp.it/notices/GRB211023A_AGILE_RM.png .
The event also triggered a partial high time resolution MCAL data
acquisition, from T1 = 2021-10-23 13:07:32.91 s +/- 0.01 (UTC) to T2 =
2021-10-23 13:08:05.20 +/- 0.01 s (UTC), and released 12480 counts in the
detector, above a background rate of 620 Hz. The time-integrated spectrum
of the first 17 s of the burst can be fitted in the energy range 0.4-50 MeV
with a single power-law with ph. ind. = -2.45 (-0.27/+0.34), resulting in a
reduced chi-squared of 0.89 (75 d.o.f.) and a fluence of 1.3e-05 ergs/cm^2
(90% confidence level), in the same energy range. The MCAL light curve can
be found at:
http://www.agilescienceapp.it/notices/075364_GRB211023A_562079268.000000.png
.
Additional analysis of AGILE data is in progress. Automatic MCAL GRB alert
Notices can be found at: https://gcn.gsfc.nasa.gov/agile_mcal.html.
GCN Circular 30965
Subject
GRB 211023A: Fermi GBM detection
Date
2021-10-24T05:04:53Z (4 years ago)
From
Suraj Poolakkil at UAH <sp0076@uah.edu>
S. Lesage (UAH), S. Poolakkil (UAH) and C. Meegan (UAH) report on behalf of
the Fermi Gamma-ray Burst Monitor Team:
"At 13:05:43 UT on 23 October 2021, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 211023A (trigger 656687148/211023546)
which was also detected by Fermi-LAT (N. Di Lalla et al. 2021, GCN 30961).
The Fermi GBM Final Real-time Localization (GCN 30958) is consistent with
the Fermi-LAT position.
The angle from the Fermi LAT boresight is 53 degrees.
The GBM light curve consists of two emission episodes with a duration (T90)
of about 80 s (10-1000 keV). The time-averaged spectrum
from T0+53 to T0+158 s is best fit by
a Band function with Epeak = 92 +/- 2 keV,
alpha = -1.74 +/- 0.01, and beta = -2.55 +/- 0.07.
The event fluence (10-1000 keV) in this time interval is
(1.114 +/- 0.007)E-08 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+72.1 s in the 10-1000 keV band is 27.4 +/- 0.7 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog:
https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html
For Fermi GBM data and info, please visit the official Fermi GBM Support
Page:
https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/"
GCN Circular 30961
Subject
GRB 211023A: Fermi-LAT detection
Date
2021-10-23T22:25:44Z (4 years ago)
From
Niccolo Di Lalla at Stanford U <niccolo.dilalla@stanford.edu>
N. Di Lalla (Stanford Univ.), F. Longo (Univ. and INFN, Trieste) and M. Ohno (Hiroshima Univ. & Eotvos Univ) report on behalf of the Fermi-LAT Collaboration:
On October 23rd, 2021, Fermi-LAT detected high-energy emission from GRB 211023A, which was also detected by Fermi GBM (trigger 656687148 / 211023546, GCN 30958). The best LAT on-ground location is found to be:
RA, Dec = 72.3, 85.3 (degrees, J2000)
with an error radius of 0.1 deg (90% containment, statistical error only).
The position was 54 deg from the LAT boresight at the time of the GBM trigger:
T0 = 13:05:43 UT.
The data from the Fermi-LAT show a significant increase in the event rate after the trigger that is temporally and spatially correlated with the GBM emission with high significance. The photon flux above 100 MeV in the time interval 0-2500 s after the trigger is 3.4 (-/+ 0.6) e-06 ph/cm2/s.
The estimated photon index above 100 MeV is -1.8 (-/+ 0.1).
The highest-energy photon is a 8.6 GeV event which is observed at 1832 seconds after the GBM trigger.
A Swift ToO has been requested for this burst.
The Fermi-LAT point of contact for this burst is Donggeun Tak (takdg123@gmail.com<mailto:takdg123@gmail.com>).
The Fermi-LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden.
GCN Circular 30958
Subject
GRB 211023A: Fermi GBM Final Real-time Localization
Date
2021-10-23T13:16:10Z (4 years ago)
From
Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>
The Fermi GBM team reports the detection of a likely LONG GRB
At 13:05:43 UT on 23 Oct 2021, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 211023A (trigger 656687148.17411 / 211023546).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 78.8, Dec = 82.3 (J2000 degrees, equivalent to J2000 05h 15m, 82d 17'), with a statistical uncertainty of 1.0 degrees.
The angle from the Fermi LAT boresight is 56.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211023546/quicklook/glg_skymap_all_bn211023546.png
The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211023546/quicklook/glg_healpix_all_bn211023546.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211023546/quicklook/glg_lc_medres34_bn211023546.gif