GCN Circular 42823
Subject
GRB 251122B: Fermi GBM Final Localization
Event
Date
2025-11-24T16:55:01Z (4 days ago)
Edited On
2025-11-24T17:29:43Z (4 days ago)
From
atrigg2@lsu.edu
Edited By
Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov>
Via
Web form
The Fermi GBM team reports the detection of a likely SHORT GRB
"At 23:44:26.90 UT on 22 November 2025, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 251121B (trigger 785547871/251122989).
The on-ground calculated location, using the Fermi GBM trigger data,
is RA = 336.52, Dec = -55.63 (J2000 degrees, equivalent to J2000 22h 26m, -55d 38'),
with a statistical uncertainty of 10.74 degrees.
The angle from the Fermi LAT boresight is 36.00 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251122989/quicklook/glg_skymap_all_bn251122989.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/bn251122989/quicklook/glg_healpix_all_bn251122989.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251122989/quicklook/glg_lc_medres34_bn251122989.gif"