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/quicklook/glg_skymap_all_bn250718296.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/bn250718296/quicklook/glg_healpix_all_bn250718296.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250718296/quicklook/glg_lc_medres34_bn250718296.gif"