TITLE: GCN CIRCULAR NUMBER: 36763 SUBJECT: GRB 240625B: Fermi GBM Final Real-time Localization DATE: 24/06/25 23:09:13 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 22:58:35 UT on 25 Jun 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240625B (trigger 741049120.43883 / 240625957).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 90.0, Dec = -11.1 (J2000 degrees, equivalent to J2000 06h 00m, -11d 05'), with a statistical uncertainty of 10.3 degrees.

The angle from the Fermi LAT boresight is 87.0 degrees.

The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240625957/q...

The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240625957/q...

The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240625957/q...

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