GRB 250926B
GCN Circular 42012
Subject
GRB 250926B: Fermi GBM Final Localization
Date
2025-09-26T21:05:58Z (6 days ago)
From
Matt Godwin <msg0028@uah.edu>
Via
Web form
The Fermi GBM team reports the detection of a likely LONG GRB
"At 19:50:31.07 UT on 26 September 2025, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 250926B (trigger 780609036/250926827).
The on-ground calculated location, using the Fermi GBM trigger data,
is RA = 291.66, Dec = -80.93 (J2000 degrees, equivalent to J2000 19h 26m, -80d 55'),
with a statistical uncertainty of 7.60 degrees.
The angle from the Fermi LAT boresight is 23 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250926827/quicklook/glg_skymap_all_bn250926827.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/bn250926827/quicklook/glg_healpix_all_bn250926827.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250926827/quicklook/glg_lc_medres34_bn250926827.gif"