TITLE:   GCN CIRCULAR
NUMBER:  45071
SUBJECT: GRB 260703B: Fermi GBM Final Localization
DATE:    26/07/03 19:21:18 GMT
FROM:    Angus Jameson <abj0023@uah.edu>

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

"At 02:25:05.66 UT on 03 July 2026, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 260703B (trigger 804738310/260703101).

The on-ground calculated location, using the Fermi GBM trigger data,
is RA = 310.5, Dec = 47.9 (J2000 degrees, equivalent to J2000 20h 42m, +47d 54'),
with a statistical uncertainty of 5.1 degrees.

The angle from the Fermi LAT boresight is 19 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260703101/quicklook/glg_skymap_all_bn260703101.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/bn260703101/quicklook/glg_healpix_all_bn260703101.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260703101/quicklook/glg_lc_medres34_bn260703101.gif"