GRB 211130A
GCN Circular 31196
Subject
GRB 211130A: MeerLICHT identification of possible afterglow candidate
Date
2021-12-10T09:16:11Z (4 years ago)
From
Simon de Wet at UCT <dwtsim002@myuct.ac.za>
S. de Wet (UCT), P.J. Groot (Radboud/UCT/SAAO), A.J. Levan (Radboud),
P.M. Vreeswijk (Radboud), report on behalf of the MeerLICHT consortium:
We observed the field of the Fermi/GBM long GRB candidate GRB 211130A
(Fermi GBM Team, GCN 31151) with the 0.6m wide-field MeerLICHT
optical telescope located at Sutherland, South Africa, starting at
2021-11-30,
18:31:26 UT, approximately 3 hours 15 minutes after the GRB trigger.
With a field of view of 2.7 square degrees, 72 MeerLICHT pointings were
required to cover the GBM sky map to a probability level of 90%. We
observed 67 out of the 72 fields three times on the first night of
observations.
The remaining 5 fields were observed once. All observations were conducted
in the q-band (g+r) with a 60s exposure time. The average 5-sigma full-frame
limiting magnitude was q = 20.79 across the observations.
Following the IPN triangulation of GRB 211130A (Kozyrev et al., GCN 31161),
a refined search for transient candidates in our data reveals a single
promising
afterglow candidate at coordinates:
RA (J2000) = 01:24:52.46 (21.2186d)
Dec (J2000) = -27:41:57.48 (-27.6993d)
calibrated against Gaia DR2. The candidate is, however, located just North
of
the IPN triangulation region, an angular distance of 8.7' from the centre
of the
IPN region and still consistent with the Konus-Wind/GBM triangulation
region.
The candidate was detected at three epochs and appears to show fading
behaviour, with 5-sigma AB magnitudes at time post-trigger of:
q = 19.83 +/- 0.07 at 3.74 hours
q = 20.05 +/- 0.10 at 5.57 hours
q = 20.66 +/- 0.20 at 7.05 hours.
No underlying source is visible in PanSTARRS and Legacy Survey DR9 images
at this position.
MeerLICHT is built and run by a consortium consisting of Radboud
University,
University of Cape Town, the South African Astronomical Observatory, the
University of Oxford, the University of Manchester and the University of
Amsterdam.
GCN Circular 31162
Subject
Konus-Wind detection of GRB 211130A
Date
2021-12-03T17:19:17Z (4 years ago)
From
Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru>
A. Ridnaia, D. Frederiks, A. Lysenko, D. Svinkin,
A. Tsvetkova, M. Ulanov, and T. Cline
on behalf of the Konus-Wind team, report:
The long-duration GRB 211130A
(Fermi GBM Final Real-time localization: The Fermi GBM team, GCN 31151;
BALROG localization: Kunzweiler et al., GCN 31152;
IPN triangulation: Kozyrev et al., GCN 31161)
triggered Konus-Wind at T0=54992.505 s UT (15:16:32.505).
The burst light curve starts with a smooth pulse, which was followed,
after a period of low-level emission, by a more intense, multi-peaked
emission complex. The total burst duration is ~21.4 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/GRB211130_T54992/
As observed by Konus-Wind, the burst
had a fluence of 9.57(-0.68,+0.75)x10^-6 erg/cm2,
and a 64-ms peak flux, measured from T0+13.456 s,
of 8.39(-2.23,+2.99)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+16.640 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 = -0.54(-0.24,+0.27)
and Ep = 164(-15,+19) keV (chi2 = 82/75 dof).
Fitting by a GRB (Band) model yields the same alpha and Ep,
and an upper limit on the high energy photon index: beta < -2.5
(chi2 = 82/74).
The spectrum near the maximum count rate
(measured from T0+8.448 to T0+16.640 s)
is best fit in the 20 keV - 6 MeV range
by the GRB (Band) model with the following parameters:
the low-energy photon index alpha = -0.40(-0.34,+0.47),
the high energy photon index beta = -2.69(-1.55,+0.43),
the peak energy Ep = 177(-31,+34) keV
(chi2 = 56/73 dof).
All the quoted errors are at the 90% confidence level.
All the quoted values are preliminary.
GCN Circular 31161
Subject
IPN triangulation of GRB 211130A
Date
2021-12-03T14:20:30Z (4 years ago)
From
Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru>
A.S. Kozyrev, D.V. Golovin, M.L. Litvak, I.G. Mitrofanov, and A.B. Sanin
on behalf of the MGNS/BepiColombo and HEND/Mars Odyssey teams,
J. Benkhoff on behalf of the BepiColombo team,
A. Ridnaia, D. Frederiks, D. Svinkin, A. Lysenko,
and T. Cline on behalf of the Konus-Wind team,
K. Hurley, on behalf of the IPN,
A. von Kienlin, X. Zhang, A. Rau, V. Savchenko, E. Bozzo,
and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team,
and
A. Goldstein, M. S. Briggs, and C. Wilson-Hodge
on behalf of the Fermi GBM team, report:
The long-duration GRB 211130A
(Fermi GBM Final Real-time localization: The Fermi GBM team, GCN 31151;
BALROG localization: Kunzweiler et al., GCN 31152)
was detected by Fermi (GBM trigger 659978192), Konus-Wind,
INTEGRAL (SPI-ACS), and BepiColombo (MGNS) at about 54987 s UT (15:16:27).
We have triangulated it to a preliminary, 3 sigma error box
whose coordinates are:
---------------------------------------------
RA(2000), deg Dec(2000), deg
---------------------------------------------
Center:
21.148 (01h 24m 35s) -27.829 (-27d 49' 46")
Corners:
20.183 (01h 20m 44s) -27.190 (-27d 11' 25")
20.317 (01h 21m 16s) -27.403 (-27d 24' 10")
22.106 (01h 28m 25s) -28.433 (-28d 25' 58")
21.973 (01h 27m 54s) -28.233 (-28d 13' 58")
---------------------------------------------
The error box area is 734 sq. arcmin, and its maximum
dimension is 2.1 deg (the minimum one is 6.5 arcmin).
The Sun distance was 113 deg.
This box may be improved.
The IPN localization is consistent with, but reduces the area of, the
Fermi final position and BALROG localizations.
A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB211130_T54992/IPN
The time history and spectrum will be given in forthcoming GCN Circulars.
GCN Circular 31154
Subject
Fermi GRB 211130A: Global MASTER-Net observations report
Date
2021-11-30T17:30:11Z (4 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov,
D. Vlasenko, G.Antipov, D.Zimnukhov, V.Senik, T.Pogrosheva, E.Minkina,
A.Chasovnikov, V.Topolev, V.Grinshpun, 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
(Irkutsk State University, API),
A. Tlatov, D. Dormidontov
(Kislovodsk Solar Station of the Pulkovo Observatory),
A. Gabovich, V.Yurkov
(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 211130A ( Fermi GBM team, GCN 31151) errorbox 693 sec after notice time and 732 sec after trigger time at 2021-11-30 15:28:39 UT, with upper limit up to 17.5 mag. The observations began at zenith distance = 74 deg. The sun altitude is -19.8 deg.
The galactic latitude b = -84 deg., longitude l = 185 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=1800540
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
802 | 2021-11-30 15:28:39 | MASTER-Kislovodsk | (01h 12m 10.65s , -24d 10m 36.9s) | P- | 140 | 15.5 |
802 | 2021-11-30 15:28:39 | MASTER-Kislovodsk | (01h 12m 21.91s , -24d 33m 47.5s) | C | 140 | 13.6 |
983 | 2021-11-30 15:31:19 | MASTER-Kislovodsk | (01h 12m 07.92s , -24d 09m 06.7s) | P- | 180 | 16.8 |
983 | 2021-11-30 15:31:19 | MASTER-Kislovodsk | (01h 12m 25.40s , -24d 32m 24.1s) | C | 180 | 13.2 |
1183 | 2021-11-30 15:34:40 | MASTER-Kislovodsk | (01h 12m 08.03s , -24d 10m 12.7s) | P- | 180 | 16.5 |
1183 | 2021-11-30 15:34:40 | MASTER-Kislovodsk | (01h 12m 20.64s , -24d 33m 26.8s) | C | 180 | 12.8 |
1384 | 2021-11-30 15:38:00 | MASTER-Kislovodsk | (01h 12m 10.08s , -24d 08m 56.4s) | P- | 180 | 16.6 |
1564 | 2021-11-30 15:38:00 | MASTER-Kislovodsk | (01h 12m 10.08s , -24d 08m 56.4s) | P- | 540 | 17.5 | Coadd
1384 | 2021-11-30 15:38:00 | MASTER-Kislovodsk | (01h 12m 22.20s , -24d 32m 06.5s) | C | 180 | 13.5 |
1584 | 2021-11-30 15:41:21 | MASTER-Kislovodsk | (01h 12m 04.09s , -24d 09m 34.1s) | P- | 180 | 17.0 |
1584 | 2021-11-30 15:41:21 | MASTER-Kislovodsk | (01h 12m 16.60s , -24d 32m 42.7s) | C | 180 | 13.7 |
1784 | 2021-11-30 15:44:41 | MASTER-Kislovodsk | (01h 12m 05.14s , -24d 08m 31.6s) | P- | 180 | 17.1 |
1785 | 2021-11-30 15:44:41 | MASTER-Kislovodsk | (01h 12m 18.01s , -24d 31m 39.2s) | C | 180 | 15.0 |
6472 | 2021-11-30 17:03:49 | MASTER-Kislovodsk | (01h 22m 39.34s , -25d 13m 11.6s) | C | 60 | 12.8 |
6793 | 2021-11-30 17:09:10 | MASTER-Kislovodsk | (01h 04m 47.15s , -23d 20m 56.2s) | C | 60 | 15.2 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.
GCN Circular 31152
Subject
GRB 211130A: BALROG localization (Fermi Trigger 659978192 / GRB 211130636)
Date
2021-11-30T16:17:17Z (4 years ago)
From
Jochen Greiner at MPE,Garching <jcg@mpe.mpg.de>
F. Kunzweiler, B. Biltzinger, F. Berlato, J. Burgess & J. Greiner (all MPE Garching) report:
The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger
659978192 at 15:16:27 on 30 Nov. 2021 were automatically fitted for spectrum
and sky location with BALROG (Burgess et al. 2018, MNRAS 476, 1427;
Berlato et al. 2019, ApJ 873, 60).
The best-fit position (1 sigma statistical errors) is:
RA(2000.0) = 18.8+/-3.0 deg
Decl.(2000.0) = -28.5+/-3.8 deg
We estimate an additional systematic error of 2 deg.
Further details are available at:
https://grb.mpe.mpg.de/grb/GRB211130636/
The Healpix map can be downloaded from:
https://grb.mpe.mpg.de/grb/GRB211130636/healpix
The location parameters are available as JSON at:
https://grb.mpe.mpg.de/grb/GRB211130636/json
GCN Circular 31151
Subject
GRB 211130A: Fermi GBM Final Real-time Localization
Date
2021-11-30T15:26:55Z (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 15:16:27 UT on 30 Nov 2021, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 211130A (trigger 659978192.028088 / 211130636).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 18.3, Dec = -24.3 (J2000 degrees, equivalent to J2000 01h 13m, -24d 18'), with a statistical uncertainty of 1.4 degrees.
The angle from the Fermi LAT boresight is 72.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211130636/quicklook/glg_skymap_all_bn211130636.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/bn211130636/quicklook/glg_healpix_all_bn211130636.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211130636/quicklook/glg_lc_medres34_bn211130636.gif