TITLE:   GCN CIRCULAR
NUMBER:  45258
SUBJECT: GRB260730A: Fermi GBM Final Localization
DATE:    26/07/30 13:35:14 GMT
FROM:    oliver.roberts@universityofgalway.ie

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

"At 04:28:34.96 UT on 30 July 2026, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB260730A (trigger 807078519/260730187).

The on-ground calculated location, using the Fermi GBM trigger data,
is RA = 290.97, Dec = +33.39 (J2000 degrees, equivalent to 19h 24', +33d 23'),
with a statistical uncertainty of 11.61 degrees.

The angle from the Fermi LAT boresight is 30 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260730187/quicklook/glg_skymap_all_bn260730187.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/bn260730187/quicklook/glg_healpix_all_bn260730187.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260730187/quicklook/glg_lc_medres34_bn260730187.gif"