GCN Circular 42595

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

"At 18:45:56.05 UT on 05 November 2025, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 251105C (trigger 784061161/251105782).
This trigger was initially classified as Below horizon by the flight software,
but is in fact a GRB.

The on-ground calculated location, using the Fermi GBM trigger data,
is RA = 212.18, Dec = 37.29 (J2000 degrees, equivalent to J2000 14h 8m, +37d 17'),
with a statistical uncertainty of 11.28 degrees.

The angle from the Fermi LAT boresight is 68 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251105782/quicklook/glg_skymap_all_bn251105782.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/bn251105782/quicklook/glg_healpix_all_bn251105782.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251105782/quicklook/glg_lc_medres34_bn251105782.gif"