TITLE:   GCN CIRCULAR
NUMBER:  41107
SUBJECT: GRB 250717B: Fermi GBM Final Real-time Localization
DATE:    25/07/17 13:54:55 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 13:44:22 UT on 17 Jul 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250717B (trigger 774452667.945704 / 250717572).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 44.4, Dec = 20.9 (J2000 degrees, equivalent to J2000 02h 57m, 20d 53'), with a statistical uncertainty of 3.8 degrees.

The angle from the Fermi LAT boresight is 70.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250717572/quicklook/glg_skymap_all_bn250717572.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/bn250717572/quicklook/glg_healpix_all_bn250717572.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250717572/quicklook/glg_lc_medres34_bn250717572.gif