GCN Circular 42531
Subject
GRB 251102A: Fermi GBM Final Real-time Localization
Event
Date
2025-11-02T02:14:07Z (3 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 02:03:46 UT on 2 Nov 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 251102A (trigger 783741831.07104 / 251102086).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 193.5, Dec = 63.9 (J2000 degrees, equivalent to J2000 12h 54m, 63d 53'), with a statistical uncertainty of 2.2 degrees.
The angle from the Fermi LAT boresight is 58.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251102086/quicklook/glg_skymap_all_bn251102086.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/bn251102086/quicklook/glg_healpix_all_bn251102086.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251102086/quicklook/glg_lc_medres34_bn251102086.gif