GCN Circular 42584
Subject
GRB 251105A: Fermi GBM Final Real-time Localization
Event
Date
2025-11-05T04:51:43Z (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 04:41:06 UT on 5 Nov 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 251105A (trigger 784010471.401264 / 251105195).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 69.6, Dec = 7.1 (J2000 degrees, equivalent to J2000 04h 38m, 7d 05'), with a statistical uncertainty of 3.3 degrees.
The angle from the Fermi LAT boresight is 41.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251105195/quicklook/glg_skymap_all_bn251105195.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/bn251105195/quicklook/glg_healpix_all_bn251105195.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251105195/quicklook/glg_lc_medres34_bn251105195.gif