TITLE:   GCN CIRCULAR
NUMBER:  42905
SUBJECT: GRB 251130B: Fermi GBM Final Real-time Localization
DATE:    25/11/30 15:43:48 GMT
FROM:    Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>

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

At 15:33:18 UT on 30 Nov 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 251130B (trigger 786209603.108754 / 251130648).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 102.1, Dec = -45.5 (J2000 degrees, equivalent to J2000 06h 48m, -45d 30'), with a statistical uncertainty of 11.5 degrees.

The angle from the Fermi LAT boresight is 108.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251130648/quicklook/glg_skymap_all_bn251130648.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/bn251130648/quicklook/glg_healpix_all_bn251130648.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251130648/quicklook/glg_lc_medres34_bn251130648.gif