GCN Circular 42820

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"