TITLE: GCN CIRCULAR NUMBER: 41118 SUBJECT: GRB 250718B: Fermi GBM Final Localization Correction DATE: 25/07/18 09:55:46 GMT FROM: Marianna Dafčíková at Masaryk University 500025@mail.muni.cz

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

"At 07:05:40.09 UT on 18 July 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250718B (trigger 774515145/250718296) which was initially named GRB 250718A (GCN 41117).

The updated on-ground calculated location, using the Fermi GBM trigger data, is RA = 213.5, Dec = 1.7 (J2000 degrees, equivalent to J2000 14h 14m, 01d 40'), with a statistical uncertainty of 11.2 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/2025/bn250718296/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/bn250718296/q...

The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250718296/q..."

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