GRB 220511A
GCN Circular 32052
Subject
GRB 220511A: Swift-XRT afterglow detection
Date
2022-05-16T07:47:56Z (3 years ago)
From
Phil Evans at U of Leicester <pae9@leicester.ac.uk>
V. D'Elia (SSDC & INAF-OAR), A. D'Ai (INAF-IASFPA), D.N. Burrows (PSU),
J. D. Gropp (PSU), J.A. Kennea (PSU), A.P. Beardmore (U. Leicester),
J.P. Osborne (U. Leicester), A. Melandri (INAF-OAB) and P.A. Evans (U.
Leicester) report on behalf of the Swift-XRT team:
Swift-XRT has conducted further observations of the field of the
Swift/BAT-GUANO-detected burst GRB 220511A (Ursi et al. GCN Circ.
32021). The observations now extend from T0+37.5 ks to T0+285.4 ks.
Of the sources reported by D'Elia et al. (GCN Circ. 32029), "Source 1"
is fading with 2.4 sigma significance and thus is believed to be the
GRB afterglow. The position of this source is RA, Dec=287.4316,
+17.7297 which is equivalent to:
RA (J2000): 19:09:43.59
Dec(J2000): +17:43:46.9
with an uncertainty of 5.4 arcsec (radius, 90% confidence). This
position is 59 arcsec from the Swift/BAT-GUANO position.
The light curve can be modelled with a power-law decay with a decay
index of alpha=0.9 (+0.9, -0.6).
The results of the XRT-team automatic analysis are available at
http://www.swift.ac.uk/xrt_products/00021498.
The results of the full analysis of the XRT observations are available
at https://www.swift.ac.uk/ToO_GRBs/00021498.
This circular is an official product of the Swift-XRT team.
GCN Circular 32033
Subject
Konus-Wind detection of GRB 220511A
Date
2022-05-13T13:04:48Z (3 years ago)
From
Dmitry Frederiks at Ioffe Institute <fred@mail.ioffe.ru>
D. Frederiks, A.Lysenko, A. Ridnaia, D. Svinkin,
A. Tsvetkova, M. Ulanov, and T. Cline,
on behalf of the Konus-Wind team, report:
The long GRB 220511A (AGILE detection: Ursi et al., GCN 32021;
AstroSat CZTI detection: Gopalakrishnan et al., GCN 32028;
Fermi-GBM observation: Veres & Meegan, GCN 32030)
triggered Konus-Wind (KW) at T0=49319.624 s UT (13:41:59.624).
The burst light curve shows a single emission pulse,
which starts at ~T0-1 s and has a total duration of ~6 s.
The Konus-Wind light curve of this GRB is available at
http://www.ioffe.ru/LEA/GRBs/GRB220511_T49319/
As observed by Konus-Wind, the burst had
a fluence of (7.8 �� 1.5)x10^-6 erg/cm^2 and
a 64-ms peak energy flux, measured from T0 + 0.832 s,
of (4.2 �� 0.7)x10^-6 erg/cm^2/s (both in the 20 keV - 10 MeV energy range).
The time-integrated spectrum (measured from T0 to T0+8.448 s)
is best fit in the 20 keV - 1.5 MeV range
by the GRB (Band) function with the following model parameters:
the low-energy photon index alpha = -0.75 (-0.19,+0.42),
the high energy photon index beta = -3.1 (-6.9,+0.8),
the peak energy Ep = 159 (-34,+21) keV,
chi2 = 57/59 dof.
All the quoted errors are estimated at the 90% confidence level.
All the presented results are preliminary.
GCN Circular 32030
Subject
GRB 220511A: Fermi GBM observation
Date
2022-05-12T16:33:33Z (3 years ago)
From
Peter Veres at UAH <veresp@gmail.com>
P. Veres and C. Meegan (both UAH)
report on behalf of the Fermi GBM Team:
"At 13:41:56.87 UT on 11 May 2022, the Fermi Gamma-Ray Burst Monitor (GBM)
triggered and located GRB 220511A (trigger 673969321 / 220511571)
which was also detected by Swift/BAT-GUANO (DeLaunay et al., GCN 32023).
The Fermi GBM Final Real-time Localization (GCN 32018) is consistent
with the Swift position.
The angle from the Fermi LAT boresight at the GBM trigger time is 112 degrees.
The GBM light curve consists of a single FRED-like pulse
with a duration (T90) of about 4.2 s (50-300 keV).
The time-averaged spectrum from T0 to T0+5.7 s is best fit by
a power law function with an exponential
high-energy cutoff. The power law index is -0.85 +/- 0.05 and
the cutoff energy, parameterized as Epeak, is 199 +/- 11 keV.
The event fluence (10-1000 keV) in this time interval is
(7.62 +/- 0.23)E-6 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+0.58 s in the 10-1000 keV band
is 20.3 +/- 0.5 ph/s/cm^2.
A Band function fits the spectrum equally well
with Epeak= 155 +/- 14 keV, alpha = -0.70 +/- 0.08 and beta = 2.18 +/- 0.12.
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 32029
Subject
GRB 220511A: Swift-XRT observations
Date
2022-05-12T13:22:28Z (3 years ago)
From
Phil Evans at U of Leicester <pae9@leicester.ac.uk>
V. D'Elia (SSDC & INAF-OAR), A. D'Ai (INAF-IASFPA), D.N. Burrows (PSU),
J. D. Gropp (PSU), J.A. Kennea (PSU), A.P. Beardmore (U. Leicester),
J.P. Osborne (U. Leicester), A. Melandri (INAF-OAB) and P.A. Evans (U.
Leicester) report on behalf of the Swift-XRT team:
Swift-XRT has performed follow-up observations of the
Swift/BAT-GUANO-detected burst GRB 220511A (DeLaunay et al. GCN Circ.
32023), collecting 5.0 ks of Photon Counting (PC) mode data between
T0+37.4 ks and T0+49.1 ks. The burst was also detected by Fermi-GBM
(GCN Circ. 32018), AGILE (Ursi et al., GCN 32021) and AstroSat CZTI
(Gopalakrishnan et al., GCN 32028).
Two uncatalogued X-ray sources have been detected, however none of them
is above the RASS limit or shows definitive signs of fading. Therefore,
at the present time we cannot identify which, if any, is the afterglow.
Details of these sources are given below:
Source 1:
RA (J2000.0): 287.4316 = 19:09:43.59
Dec (J2000.0): +17.7297 = +17:43:46.9
Error: 5.4 arcsec (radius, 90% conf.)
Count-rate: (4.7 +/- 1.2)e-3 ct s^-1
Distance: 59 arcsec from Swift/BAT-GUANO position.
Flux: (1.94 +/- 0.51)e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV)
Source 3:
RA (J2000.0): 287.5100 = 19:10:2.41
Dec (J2000.0): +17.7394 = +17:44:21.8
Error: 4.0 arcsec (radius, 90% conf. [Enhanced position])
Count-rate: (3.9 [+1.2, -1.0])e-3 ct s^-1
Distance: 219 arcsec from Swift/BAT-GUANO position.
Flux: (7.9 [+2.5, -2.1])e-14 erg cm^-2 s^-1 (observed, 0.3-10 keV)
A catalogued source was also detected.
The results of the XRT-team automatic analysis of the XRT observations,
including a position-specific upper limit calculator, are available at
https://www.swift.ac.uk/ToO_GRBs/00021498.
This circular is an official product of the Swift-XRT team.
GCN Circular 32028
Subject
GRB 220511A: AstroSat CZTI detection
Date
2022-05-12T11:33:37Z (3 years ago)
From
Gaurav Waratkar at IIT,Bombay <gauravwaratkar@iitb.ac.in>
R. Gopalakrishnan (IUCAA), V. Prasad (IUCAA), G. Waratkar (IITB), A.
Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (IUCAA), A. R. Rao
(IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat
CZTI collaboration:
Analysis of AstroSat CZTI data with the CIFT framework (Sharma et al.,
2021, JApA, 42, 73) showed detection of GRB 220511A which was also
reported by Fermi GBM (GCN #32018), AGILE (Ursi et al., GCN #32021), and
Swift/BAT-GUANO (DeLaunay et al., GCN #32023).
The source was clearly detected in the 20-200 keV energy range. The
light curve peaked at 2022-05-11 13:41:57.45 UT. The measured peak count
rate associated with the burst is 802 (+197, -74) counts/s above the
background in the combined data of four quadrants, with a total of 1126
(+156, -184) counts. The local mean background count rate was 525 (+9,
-9) counts/s. Using cumulative rates, we measure a T90 of 1.8 (+0.8,
-0.4) s.
It was also clearly detected in the CsI anticoincidence (Veto) detector
in the 100-500 keV energy range.
CZTI GRB detections are reported regularly on the payload site at
http://astrosat.iucaa.in/czti/?q=grb. CZTI is built by a TIFR-led
consortium of institutes across India, including VSSC, ISAC, IUCAA, SAC,
and PRL. The Indian Space Research Organisation funded, managed, and
facilitated the project.
GCN Circular 32027
Subject
GRB 220511A: BOOTES-2/TELMA optical upper limit
Date
2022-05-12T09:07:40Z (3 years ago)
From
Youdong HU at IAA-CSIC <huyoudong072@hotmail.com>
Y.-D. Hu, E. Fernandez-Garcia, T.-R. Sun, A. J. Castro-Tirado, M.D. Caballero-Garcia, R. Sanchez-Ramirez, I. Perez-Garcia (IAA-CSIC), C. Perez del Pulgar, A. Castellon, M. A. Castro Tirado (Univ. de Malaga), R. Fernandez-Munoz (IHSM/UMA-CSIC) and M. Jelinek (ASU-CAS), on behalf of a larger collaboration, report:
Following the detection of GRB 220511A by Fermi (GBM team GCNC 32018), AGILE (Ursi et al. CNCN 32021) and Swift (DeLaunay et al. GCNC 32023), the 0.6m BOOTES-2/TELMA robotic telescope in Algarrobo Costa (Malaga, Spain) pointed to the Swift/BAT-GUANO position on May. 11 at 22:48:06 UT (~9.1 hrs after trigger). No new source is detected in a 11' x 11' FOV within the BAT-GUANO error region in the co-added image (60 x 10 s, clear filter) down to 18.7 mag. This non-detection is consistent with the MASTER results (Lipunov et al. GCNC 32022).
We thank the staff at IHSM/UMA-CSIC La Mayora for its excellent support.
GCN Circular 32024
Subject
GRB 220511A: Swift ToO observations
Date
2022-05-11T23:29:11Z (3 years ago)
From
Phil Evans at U of Leicester <pae9@leicester.ac.uk>
P. A. Evans (U. Leicester) reports on behalf of the Swift team:
Swift has initiated a ToO observation of the Swift/BAT-GUANO GRB 220511A.
Automated analysis of the XRT data will be presented online at
https://www.swift.ac.uk/ToO_GRBs/00021498
Any uncatalogued X-ray sources detected in this analysis will be
reported on this website and via GCN COUNTERPART notices. These are
not necessarily related to the Swift/BAT-GUANO event. Any X-ray source
considered to be a probable afterglow candidate will be reported via a
GCN Circular after manual consideration.
Details of the XRT automated analysis methods are detailed in Evans et
al. (2007, A&A, 469, 379; 2009, MNRAS, 397, 1177 and 2014, ApJS, 210, 8).
This circular is an official product of the Swift-XRT team.
GCN Circular 32023
Subject
GRB 220511A: Swift/BAT-GUANO arcminute localization
Date
2022-05-11T22:15:07Z (3 years ago)
From
Aaron Tohuvavohu at U Toronto <aaron.tohu@gmail.com>
James DeLaunay (U Alabama), Aaron Tohuvavohu (U Toronto), Jamie A.
Kennea (PSU), Gayathri Raman (PSU) report:
Swift/BAT did not trigger on GRB 220511A (T0: 2022-05-11T13:47:57
UTC, Fermi/GBM GCN 32018, INTEGRAL/SPI-ACS trig#9912, GECAM trig #
utn220511_134156_GECAMb, AGILE GCN 32021).
The GECAM and INTEGRAL notices, distributed in near real-time, triggered the
Swift Mission Operations Center operated Gamma-ray Urgent Archiver for
Novel Opportunities (GUANO; Tohuvavohu et al. 2020, ApJ, 900, 1).
Upon trigger by this notice, GUANO sent a command to the Swift Burst
Alert Telescope (BAT) to save 200 seconds of BAT event-mode data from
[-50,+150] seconds around the time of the burst. All the requested
event mode data was delivered to the ground.
The burst is detected in BAT with a duration of ~5 seconds.
The burst occurred during a Swift slew.
The burst location was found in a mosaiced slew image with an SNR of ~10.
The BAT position is
RA, Dec = 287.446, 17.739 deg which is
RA(J2000) = 19h 09m 47.04s
Dec(J2000) = 17d 44��� 20.4���
with an estimated uncertainty of 7 arcmin.
This position is consistent with the Ferm/GBM localization (GCN 32018).
XRT and UVOT follow-up has been requested. Results of follow-up
observations will be reported in future circulars.
GUANO is a fully autonomous, extremely low latency, spacecraft
commanding pipeline designed for targeted recovery of BAT event mode
data around the times of compelling astrophysical events to enable
more sensitive GRB searches.
A live reporting of Swift/BAT event data recovered by GUANO can b
found at: https://www.swift.psu.edu/guano/
GCN Circular 32022
Subject
Fermi GRB 220511A: Global MASTER-Net observations report
Date
2022-05-11T17:15:24Z (3 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, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin
(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),
L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez
(INAOE, Guillermo Haro Astrophysics Observatory),
A. Tlatov, D. Dormidontov
(Kislovodsk Solar Station of the Pulkovo Observatory),
A. Gabovich, V.Yurkov
(Blagoveschensk Educational State University)
MASTER-Amur robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Blagoveshchensk State Pedagogical University) started inspect of the Fermi GRB 220511A ( Fermi GBM team, GCN 32018) errorbox 11983 sec after notice time and 12018 sec after trigger time at 2022-05-11 17:02:15 UT, with upper limit up to 13.3 mag. The observations began at zenith distance = 42 deg. The sun altitude is -18.9 deg.
The galactic latitude b = 5 deg., longitude l = 50 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=1969847
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
12109 | 2022-05-11 17:02:15 | MASTER-Amur | (19h 05m 21.07s , +17d 46m 28.2s) | C | 180 | 12.1 |
12455 | 2022-05-11 17:08:01 | MASTER-Amur | (19h 05m 20.14s , +17d 47m 39.0s) | C | 180 | 13.3 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.
GCN Circular 32021
Subject
GRB 220511A: AGILE detection
Date
2022-05-11T16:54:58Z (3 years ago)
From
Alessandro Ursi at INAF/IAPS <alessandro.ursi@gmail.com>
A. Ursi (INAF/IAPS), C. Pittori, F. Verrecchia (SSDC, and INAF/OAR), M.
Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), A. Argan, M. Cardillo, C.
Casentini, Y. Evangelista, E. Menegoni, L. Foffano, G. Piano (INAF/IAPS),
F. Lucarelli (SSDC, and INAF/OAR), A. Bulgarelli, A. Di Piano, V. Fioretti,
F. Fuschino, G. Panebianco, N. Parmiggiani (INAF/OAS-Bologna), M. Marisaldi
(INAF/OAS-Bologna, and Bergen University), M. Pilia, A. Trois
(INAF/OA-Cagliari), M. Romani (INAF/OA-Brera), 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 GRB 220511A at T0 = 2022-05-11 13:41:57
(UTC), reported by Fermi GBM (GCN #32018).
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 3 s and
it released a total number of 410 counts in the SA detector (above a
background rate of 70 Hz), 5150 counts in the MCAL detector (above a
background rate of 1230 Hz), and 15270 counts in the AC detector (above a
background rate of 3500 Hz). The AGILE ratemeter light curves can be found
at http://www.agilescienceapp.it/notices/GRB220511A_AGILE_RM.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 32019
Subject
GRB 220511A: BALROG localization (Fermi Trigger 673969321/ GRB 220511571)
Date
2022-05-11T14:03:45Z (3 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 673969321
at 13:41:56 on 11 May 2022 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) = 291.9+/-1.4 deg
Decl.(2000.0) = 19.7+/-1.0 deg
We estimate an additional systematic error of 1 deg.
Further details are available at:
https://grb.mpe.mpg.de/grb/GRB220511571/
The Healpix map can be downloaded from:
https://grb.mpe.mpg.de/grb/GRB220511571/healpix
The location parameters are available as JSON at:
https://grb.mpe.mpg.de/grb/GRB220511571/json
GCN Circular 32018
Subject
GRB 220511A: Fermi GBM Final Real-time Localization
Date
2022-05-11T13:52:24Z (3 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 13:41:56 UT on 11 May 2022, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 220511A (trigger 673969321.870432 / 220511571).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 285.4, Dec = 17.5 (J2000 degrees, equivalent to J2000 19h 01m, 17d 30'), with a statistical uncertainty of 1.0 degrees.
The angle from the Fermi LAT boresight is 110.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220511571/quicklook/glg_skymap_all_bn220511571.png
The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220511571/quicklook/glg_healpix_all_bn220511571.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220511571/quicklook/glg_lc_medres34_bn220511571.gif