TITLE:   GCN CIRCULAR
NUMBER:  42536
SUBJECT: GRB 251103A: Fermi GBM Final Localization
DATE:    25/11/03 05:57:12 GMT
FROM:    Matt Godwin <msg0028@uah.edu>

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

"At 04:46:28.11 UT on 03 November 2025, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 251103A (trigger 783837993/251103199).

The on-ground calculated location, using the Fermi GBM trigger data,
is RA = 148.67, Dec = 15.71 (J2000 degrees, equivalent to J2000 9h 54m, +15d 42'),
with a statistical uncertainty of 2.03 degrees.

The angle from the Fermi LAT boresight is 112 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251103199/quicklook/glg_skymap_all_bn251103199.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/bn251103199/quicklook/glg_healpix_all_bn251103199.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251103199/quicklook/glg_lc_medres34_bn251103199.gif"