GCN Circular 42961
Subject
GRB 251202B: Fermi GBM Final Real-time Localization
Event
Date
2025-12-02T18:37:45Z (16 hours ago)
From
Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>
Via
email
The Fermi GBM team reports the detection of a likely SHORT GRB
At 18:27:03 UT on 2 Dec 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 251202B (trigger 786392828.111108 / 251202769).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 347.2, Dec = -23.3 (J2000 degrees, equivalent to J2000 23h 08m, -23d 18'), with a statistical uncertainty of 4.5 degrees.
The angle from the Fermi LAT boresight is 92.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251202769/quicklook/glg_skymap_all_bn251202769.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/bn251202769/quicklook/glg_healpix_all_bn251202769.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251202769/quicklook/glg_lc_medres34_bn251202769.gif