GCN Circular 45218
Subject
GRB 260726A: Fermi GBM Final Real-time Localization
Event
Date
2026-07-26T23:55:25Z (16 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 23:44:49 UT on 26 Jul 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260726A (trigger 806802294.070584 / 260726989).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 19.0, Dec = 52.4 (J2000 degrees, equivalent to J2000 01h 15m, 52d 23'), with a statistical uncertainty of 11.9 degrees.
The angle from the Fermi LAT boresight is 13.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260726989/quicklook/glg_skymap_all_bn260726989.png
The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260726989/quicklook/glg_healpix_all_bn260726989.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260726989/quicklook/glg_lc_medres34_bn260726989.gif