TITLE:   GCN CIRCULAR
NUMBER:  43003
SUBJECT: GRB 251126B: Fermi GBM Final Localization
DATE:    25/12/05 17:22:08 GMT
FROM:    Boyan A. Hristov at UAH <bah0046@uah.edu>

The Fermi GBM team reports the detection of a likely LONG GRB

"At 15:57:02.80 UT on 26 November 2025, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 251126B (trigger 785865427/251126665).

The on-ground calculated location, using the Fermi GBM trigger data,
is RA = 321.15, Dec = -28.24 (J2000 degrees, equivalent to J2000 21h
24m, -28d 14'),
with a statistical uncertainty of 14.32 degrees.

The angle from the Fermi LAT boresight is 73 degrees.

The skymap can be found here:
sftp://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251126665/quicklook/glg_skymap_all_bn251126665.png

The HEALPix FITS file, including the estimated localization
systematic, can be found here:
sftp://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251126665/quicklook/glg_healpix_all_bn251126665.fit

The GBM light curve can be found here:
sftp://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251126665/quicklook/glg_lc_medres34_bn251126665.gif"