GCN Circular 45081
Subject
GRB 260705B: Fermi GBM Final Real-time Localization
Event
Date
2026-07-06T00:19:12Z (4 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 22:46:36 UT on 5 Jul 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260705B (trigger 804984401.559966 / 260705949).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 68.5, Dec = -30.8 (J2000 degrees, equivalent to J2000 04h 33m, -30d 48'), with a statistical uncertainty of 3.0 degrees.
The angle from the Fermi LAT boresight is 77.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260705949/quicklook/glg_skymap_all_bn260705949.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/bn260705949/quicklook/glg_healpix_all_bn260705949.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260705949/quicklook/glg_lc_medres34_bn260705949.gif