TITLE:   GCN CIRCULAR
NUMBER:  41142
SUBJECT: GRB 250723B: Fermi GBM Final Real-time Localization
DATE:    25/07/23 14:56:17 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 14:45:37 UT on 23 Jul 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250723B (trigger 774974742.499166 / 250723615).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 358.0, Dec = 50.6 (J2000 degrees, equivalent to J2000 23h 52m, 50d 36'), with a statistical uncertainty of 3.1 degrees.

The angle from the Fermi LAT boresight is 114.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250723615/quicklook/glg_skymap_all_bn250723615.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/bn250723615/quicklook/glg_healpix_all_bn250723615.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250723615/quicklook/glg_lc_medres34_bn250723615.gif