TITLE:   GCN CIRCULAR
NUMBER:  34256
SUBJECT: GRB 230725B: Fermi GBM Final Real-time Localization
DATE:    23/07/25 13:08:51 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 12:58:19 UT on 25 Jul 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230725B (trigger 711982704.317538 / 230725540).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 30.2, Dec = 47.8 (J2000 degrees, equivalent to J2000 02h 00m, 47d 47'), with a statistical uncertainty of 1.0 degrees.

The angle from the Fermi LAT boresight is 2.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230725540/quicklook/glg_skymap_all_bn230725540.png

The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230725540/quicklook/glg_healpix_all_bn230725540.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230725540/quicklook/glg_lc_medres34_bn230725540.gif