TITLE:   GCN CIRCULAR
NUMBER:  45289
SUBJECT: GRB 260805B: Fermi GBM Final Localization
DATE:    26/08/05 15:19:19 GMT
FROM:    Marianna Dafčíková at Masaryk University <500025@mail.muni.cz>

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

"At 11:36:52.81 UT on 05 August 2026, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 260805B (trigger 807622617/260805484).

The on-ground calculated location, using the Fermi GBM trigger data,
is RA = 259.42, Dec = 64.59 (J2000 degrees, equivalent to J2000 17h 17m, +64d 35'),
with a statistical uncertainty of 2.15 degrees.

The angle from the Fermi LAT boresight is 31 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260805484/quicklook/glg_skymap_all_bn260805484.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/bn260805484/quicklook/glg_healpix_all_bn260805484.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260805484/quicklook/glg_lc_medres34_bn260805484.gif"