GCN Circular 42671
Subject
GRB 251113A: Fermi GBM Final Real-time Localization
Event
Date
2025-11-13T17:48:06Z (9 days 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 LONG GRB
At 17:37:30 UT on 13 Nov 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 251113A (trigger 784748255.384296 / 251113734).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 55.1, Dec = 8.2 (J2000 degrees, equivalent to J2000 03h 40m, 8d 11'), with a statistical uncertainty of 1.5 degrees.
The angle from the Fermi LAT boresight is 52.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251113734/quicklook/glg_skymap_all_bn251113734.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/bn251113734/quicklook/glg_healpix_all_bn251113734.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251113734/quicklook/glg_lc_medres34_bn251113734.gif