GRB 220810A
GCN Circular 32455
Subject
GRB 220810A: Fermi GBM Final Real-time Localization
Date
2022-08-10T23:26:25Z (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 23:15:42 UT on 10 Aug 2022, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 220810A (trigger 681866147.080906 / 220810969).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 309.4, Dec = 2.7 (J2000 degrees, equivalent to J2000 20h 37m, 2d 42'), with a statistical uncertainty of 1.6 degrees.
The angle from the Fermi LAT boresight is 69.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220810969/quicklook/glg_skymap_all_bn220810969.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/bn220810969/quicklook/glg_healpix_all_bn220810969.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220810969/quicklook/glg_lc_medres34_bn220810969.gif
GCN Circular 32456
Subject
Fermi GRB 220810A: Global MASTER-Net observations report
Date
2022-08-11T00:15:15Z (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-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB 220810A ( Fermi GBM team, GCN 32455) errorbox 445 sec after notice time and 476 sec after trigger time at 2022-08-10 23:23:38 UT, with upper limit up to 18.3 mag. The observations began at zenith distance = 39 deg. The sun altitude is -71.2 deg.
The galactic latitude b = -22 deg., longitude l = 49 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=2053838
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
521 | 2022-08-10 23:23:38 | MASTER-SAAO | (20h 45m 02.76s , +02d 31m 33.6s) | C | 90 | 17.6 |
656 | 2022-08-10 23:25:37 | MASTER-SAAO | (20h 36m 27.23s , +02d 32m 24.0s) | C | 120 | 17.8 |
821 | 2022-08-10 23:25:37 | MASTER-SAAO | (20h 36m 27.24s , +02d 32m 24.0s) | C | 450 | 18.3 | Coadd
821 | 2022-08-10 23:28:08 | MASTER-SAAO | (20h 36m 30.98s , +02d 34m 05.9s) | C | 150 | 17.9 |
1018 | 2022-08-10 23:31:09 | MASTER-SAAO | (20h 36m 24.61s , +02d 33m 36.9s) | C | 180 | 17.4 |
1228 | 2022-08-10 23:34:40 | MASTER-SAAO | (20h 36m 24.10s , +02d 34m 44.8s) | C | 180 | 17.9 |
1438 | 2022-08-10 23:38:10 | MASTER-SAAO | (20h 36m 29.40s , +02d 33m 51.2s) | C | 180 | 17.8 |
1649 | 2022-08-10 23:41:41 | MASTER-SAAO | (20h 36m 23.40s , +02d 32m 58.0s) | C | 180 | 17.0 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.
GCN Circular 32460
Subject
GRB 220810A: MeerLICHT detection of two afterglow candidates
Date
2022-08-12T15:23:28Z (3 years ago)
From
Simon de Wet at UCT <dwtsim002@myuct.ac.za>
S. de Wet (UCT), P.J. Groot (Radboud/UCT/SAAO), D. Pieterse (Radboud), P.M.
Vreeswijk (Radboud), A.J. Levan (Radboud) and D.B. Malesani (Radboud and
DAWN/NBI) report on behalf of the MeerLICHT consortium:
Following the detection of GRB 220810A by Fermi/GBM (Fermi GBM team, GCN
32455), the 0.6 m wide-field MeerLICHT optical telescope began a series of
automatically-triggered 60 s q-band exposures of a number of fields
encompassing the GBM error box. Observations began approximately 14 minutes
post-trigger at 23:30:01 UT on 2022 August 10, and continued for an hour.
A total of 20 fields encompassing a cumulative probability of 58% were
observed once each. Within our difference-imaging products for this dataset
we identify two new transient candidates with the following coordinates,
brightness, and observing times:
+---------------------------+-------------------------+----------------+------------------+----------+
| RA (J2000) | Dec (J2000) | Mag (AB) |
5-sigma limiting | UT time |
| | | |
mag (AB) | |
+---------------------------+-------------------------+----------------+------------------+----------+
| 20:45:15.77 (311.31569d) | +05:06:39.95 (5.11110d) | 11.51 +/- 0.06 | q
> 15.79 | 23:59:19 |
+---------------------------+-------------------------+----------------+------------------+----------+
| 20:49:24.58 (312.35241d) | +01:56:09.64 (1.93601d) | 17.52 +/- 0.07 | q
> 18.77 | 23:44:42 |
+---------------------------+-------------------------+----------------+------------------+----------+
These positions are calibrated against Gaia DR2 with a positional
uncertainty of 0.1" in each coordinate. We note that the first, bright
candidate was identified in an image in which the sources are trailed.
However, human inspection confirms that the source is not an artefact.
The position of both transients is within the 50% probability region of the
GBM error box, and no objects consistent with these positions and observing
times were found in the Minor Planet Centre database. We also note that no
underlying source is visible in archival PanSTARRS images at these
positions.
We obtained further observations of the second, fainter source on the
following night and obtained a 5-sigma limiting magnitude of q > 19.22 at
the transient position, consistent with fading behaviour. Further follow-up
observations are encouraged in order to determine if either of these
sources is the afterglow of GRB 220810A.
MeerLICHT is built and run by a consortium consisting of Radboud
University, the University of Cape Town, the South African Astronomical
Observatory, the University of Oxford, the University of Manchester and the
University of Amsterdam.
GCN Circular 32461
Subject
GRB 220810A: Swift ToO observations
Date
2022-08-12T18:42:04Z (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 Fermi/GBM GRB 220810A.
Automated analysis of the XRT data will be presented online at
https://www.swift.ac.uk/ToO_GRBs/00021510
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 Fermi/GBM 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 32464
Subject
GRB 220810A: Swift-XRT observations
Date
2022-08-13T09:28:21Z (3 years ago)
From
Phil Evans at U of Leicester <pae9@leicester.ac.uk>
J. D. Gropp (PSU), J.A. Kennea (PSU), A. Tohuvavohu (U. Toronto), A.P.
Beardmore (U. Leicester), J.P. Osborne (U. Leicester), A. Melandri
(INAF-OAB), T. Sbarrato (INAF-OAB), P. D'Avanzo (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 second optical
afterglow candidate observed by MeerLICHT (de Wet et al. GCN Circ.
32460) of the Fermi/GBM detected burst GRB 220810A (Fermi GBM team, GCN
32455), collecting 4.9 ks of Photon Counting (PC) mode data between
T0+156.3 ks and T0+180.2 ks.
No X-ray sources have been detected consistent with being within 9.9
arcsec of the MeerLICHT optical afterglow candidate position. The
3-sigma upper limit in the field is 0.003 ct s^-1, corresponding to a
0.3-10 keV observed flux of 1.1e-13 erg cm^-2 s^-1 (assuming a typical
GRB spectrum).
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/00021510.
This circular is an official product of the Swift-XRT team.
GCN Circular 32469
Subject
GRB 220810A: Further Swift-XRT observations
Date
2022-08-14T08:30:56Z (3 years ago)
From
Paolo D'Avanzo at INAF-OAB <pda.davanzo@gmail.com>
J. D. Gropp (PSU), J.A. Kennea (PSU), A. Tohuvavohu (U. Toronto), A.P. Beardmore (U. Leicester),
J.P. Osborne (U. Leicester), A. Melandri (INAF-OAB), T. Sbarrato (INAF-OAB), P. D'Avanzo (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 first optical afterglow candidate observed by
MeerLICHT (de Wet et al. GCN Circ. 32460) of the Fermi/GBM detected burst GRB 220810A
(Fermi GBM team, GCN 32455), collecting 2.0 ks of Photon Counting (PC) mode data between
T0+202.1 ks and T0+208.1 ks.
No X-ray sources have been detected at the MeerLICHT optical afterglow candidate position.
The 3-sigma upper limit in the field is 0.006 ct s^-1, corresponding to a 0.3-10 keV observed flux
of 2.2e-13 erg cm^-2 s^-1 (assuming a typical GRB spectrum).
This circular is an official product of the Swift-XRT team.