GCN Circular 45237

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

"At 04:37:01.48 UT on 28 July 2026, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 260728A (trigger 806906226/260728192).

The on-ground calculated location, using the Fermi GBM trigger data,
is RA = 262.86, Dec = -48.57 (J2000 degrees, equivalent to J2000 17h 31m, -48d 34'),
with a statistical uncertainty of 3.53 degrees.

The angle from the Fermi LAT boresight is 64 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260728192/quicklook/glg_skymap_all_bn260728192.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/bn260728192/quicklook/glg_healpix_all_bn260728192.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260728192/quicklook/glg_lc_medres34_bn260728192.gif"