TITLE:   GCN CIRCULAR
NUMBER:  42968
SUBJECT: GRB 251203A: Fermi GBM Final Real-time Localization
DATE:    25/12/03 11:49:53 GMT
FROM:    Cuán de Barra at UCD <cuan.debarra@ucdconnect.ie>

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

"At 08:18:45.15 UT on 03 December 2025, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 251203A (trigger 786442730/251203346).

The on-ground calculated location, using the Fermi GBM trigger data,
is RA = 165.6, Dec = -46.9  (J2000 degrees, equivalent to J2000 11h 02m, 46d 54'),
with a statistical uncertainty of 2.2 degrees.

The angle from the Fermi LAT boresight is 58 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251203346/quicklook/glg_skymap_all_bn251203346.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/bn251203346/quicklook/glg_healpix_all_bn251203346.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251203346/quicklook/glg_lc_medres34_bn251203346.gif"