TITLE:   GCN CIRCULAR
NUMBER:  42823
SUBJECT: GRB 251122B: Fermi GBM Final Localization
DATE:    25/11/24 16:55:01 GMT
FROM:    atrigg2@lsu.edu

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"