GCN Circular 45121
Subject
GRB 260709A: Fermi GBM Final Real-time Localization
Event
Date
2026-07-09T01:18:22Z (6 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 01:07:32 UT on 9 Jul 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260709A (trigger 805252057.543312 / 260709047).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 84.1, Dec = 74.0 (J2000 degrees, equivalent to J2000 05h 36m, 74d 00'), with a statistical uncertainty of 4.0 degrees.
The angle from the Fermi LAT boresight is 106.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260709047/quicklook/glg_skymap_all_bn260709047.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/bn260709047/quicklook/glg_healpix_all_bn260709047.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260709047/quicklook/glg_lc_medres34_bn260709047.gif