GRB 251124A
GCN Circular 42826
Subject
GRB 251124A: Fermi GBM Localization by automated pipeline
Date
2025-11-24T17:34:45Z (6 days ago)
Edited On
2025-11-24T19:35:26Z (6 days ago)
From
Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>
Edited By
Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov>
Via
email
The Fermi GBM team reports the detection of a likely LONG GRB
At 12:58:03 UT on 24 Nov 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 251124a (trigger 785681888.46989 / 251124540), which has also been reported in GCN 42820. An interruption in the automated pipeline caused the automated circular to be distributed later than normal.
The on-ground automated localization is consistent with the location in GCN 42820.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251124540/quicklook/glg_skymap_all_bn251124540.png
The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251124540/quicklook/glg_healpix_all_bn251124540.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251124540/quicklook/glg_lc_medres34_bn251124540.gif
GCN Circular 42821
Subject
Fermi GRB 251124a: Global MASTER-Net observations report
Date
2025-11-24T15:30:22Z (6 days ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
Via
email
V.Lipunov, E.Gorbovskoy, A.Kuznetsov, K.Zhirkov, I.Panchenko, N.Tiurina, P.Balanutsa, V.Topolev, D.Vlasenko,
G.Antipov, A.Sankovich, Yu.Tselik, Ya.Kechin, V.Senik, A.Chasovnikov, K.Labsina, I. Gorbunov (Lomonosov MSU),
O.Gress, N.Budnev (ISU),
C.Francile, F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
A.Sosnovskij (CrAO),
A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity),
D.Buckley (SAAO),
R.Rebolo (The Instituto de Astrofisica de Canarias),
L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,
A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory)
MASTER-Kislovodsk robotic telescope [1] located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB 251124a ( Fermi GBM team, GCN 42820) errorbox 5857 sec after notice time and 5878 sec after trigger time at 2025-11-24 14:36:01 UT, with upper limit up to 13.0 mag. Observations started at twilight. The observations began at zenith distance = 62 deg. The sun altitude is -10.2 deg.
The galactic latitude b = 29 deg., longitude l = 38 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=3050796
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
5938 | 2025-11-24 14:36:01 | MASTER-Kislovodsk | (17h 11m 31.23s , +16d 54m 33.8s) | P- | 120 | 12.6 |
6078 | 2025-11-24 14:38:21 | MASTER-Kislovodsk | (17h 11m 31.15s , +16d 54m 22.6s) | P- | 120 | 12.5 |
6218 | 2025-11-24 14:40:41 | MASTER-Kislovodsk | (17h 11m 32.20s , +17d 16m 49.8s) | P| | 120 | 12.2 |
6218 | 2025-11-24 14:40:41 | MASTER-Kislovodsk | (17h 11m 31.11s , +16d 54m 13.1s) | P- | 120 | 13.0 |
The observation and reduction will continue.
The message may be cited.
[1] - V.M. Lipunov, V.G. Kornilov, E.S. Gorbovskoy, N.A. Tiurina & A.S.Kuznetsov, 2023, Astronomical Robotic Networks and Operative Multichanel Astrophysics, Lomonosov MSU PRESS, 591pp.
http : // www.pereplet.ru/lipunov/625.html
GCN Circular 42820
Subject
GRB 251124a: Fermi GBM Final Localization
Date
2025-11-24T15:09:47Z (6 days ago)
From
Andreas von Kienlin at MPE <azk@mpe.mpg.de>
Via
email
The Fermi GBM team reports the detection of a LONG GRB
"At 12:58:03.47 UT on 24 November 2025, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 251124a (trigger 785681888/251124540).
The on-ground calculated location, using the Fermi GBM trigger data,
is RA = 258.14, Dec = 16.86 (J2000 degrees, equivalent to J2000 17h 12m, +16d 51'),
with a statistical uncertainty of 1.00 degrees.
The angle from the Fermi LAT boresight is 63 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251124540/quicklook/glg_skymap_all_bn251124540.png
The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251124540/quicklook/glg_healpix_all_bn251124540.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251124540/quicklook/glg_lc_medres34_bn251124540.gif"