GCN Circular 44878
Subject
GRB 260608C: Fermi GBM Final Real-time Localization
Event
Date
2026-06-09T00:06:51Z (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 23:54:23 UT on 8 Jun 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260608C (trigger 802655668.086186 / 260608996).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 245.4, Dec = 47.8 (J2000 degrees, equivalent to J2000 16h 21m, 47d 47'), with a statistical uncertainty of 9.6 degrees.
The angle from the Fermi LAT boresight is 122.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260608996/quicklook/glg_skymap_all_bn260608996.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/bn260608996/quicklook/glg_healpix_all_bn260608996.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260608996/quicklook/glg_lc_medres34_bn260608996.gif