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/q...

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/q...

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

View this GCN Circular online at https://gcn.nasa.gov/circulars/40909. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...