TITLE:   GCN CIRCULAR
NUMBER:  40909
SUBJECT: GRB 250703A: Fermi GBM Final Real-time Localization
DATE:    25/07/03 09:28:11 GMT
FROM:    Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>

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

At 09:07:31 UT on 3 Jul 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250703A (trigger 773226456.426922 / 250703380).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 337.6, Dec = 26.1 (J2000 degrees, equivalent to J2000 22h 30m, 26d 06'), with a statistical uncertainty of 1.2 degrees.

The angle from the Fermi LAT boresight is 131.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250703380/quicklook/glg_skymap_all_bn250703380.png

The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250703380/quicklook/glg_healpix_all_bn250703380.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250703380/quicklook/glg_lc_medres34_bn250703380.gif