TITLE:   GCN CIRCULAR
NUMBER:  45313
SUBJECT: GRB 260808A: Fermi GBM Final Real-time Localization
DATE:    26/08/08 03:02:15 GMT
FROM:    Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>

The Fermi GBM team reports the detection of a likely LONG GRB

At 02:51:42 UT on 8 Aug 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260808A (trigger 807850307.310674 / 260808119).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 341.8, Dec = 14.1 (J2000 degrees, equivalent to J2000 22h 47m, 14d 05'), with a statistical uncertainty of 2.2 degrees.

The angle from the Fermi LAT boresight is 72.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260808119/quicklook/glg_skymap_all_bn260808119.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/bn260808119/quicklook/glg_healpix_all_bn260808119.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260808119/quicklook/glg_lc_medres34_bn260808119.gif