GCN Circular 42195
Subject
GRB 251011A: Fermi GBM Final Real-time Localization
Event
Date
2025-10-11T03:52:08Z (a day 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 03:41:40 UT on 11 Oct 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 251011A (trigger 781846905.087994 / 251011154).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 2.6, Dec = 43.3 (J2000 degrees, equivalent to J2000 00h 10m, 43d 17'), with a statistical uncertainty of 2.4 degrees.
The angle from the Fermi LAT boresight is 63.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251011154/quicklook/glg_skymap_all_bn251011154.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/bn251011154/quicklook/glg_healpix_all_bn251011154.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251011154/quicklook/glg_lc_medres34_bn251011154.gif