GCN 45200: GRB 260723A: Fermi GBM Final Localization

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

"At 13:54:48.40 UT on 23 July 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located  GRB 260723A (trigger 806507693/260723580).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 284.5, Dec = 7.7 (J2000 degrees, equivalent to J2000 18h 57m, +7d 42'), with a statistical uncertainty of 9.5 degrees.

The angle from the Fermi LAT boresight is 87 degrees.

The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260723580/quicklook/glg_skymap_all_bn260723580.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/bn260723580/quicklook/glg_healpix_all_bn260723580.fit

The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260723580/quicklook/glg_lc_medres34_bn260723580.gif"