TITLE: GCN CIRCULAR NUMBER: 39548 SUBJECT: GRB 250302A: Fermi GBM Final Real-time Localization DATE: 25/03/02 13:57:01 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 13:46:32 UT on 2 Mar 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250302A (trigger 762615997.991246 / 250302574).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 236.4, Dec = 12.2 (J2000 degrees, equivalent to J2000 15h 45m, 12d 11'), with a statistical uncertainty of 5.4 degrees.

The angle from the Fermi LAT boresight is 67.0 degrees.

The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250302574/q...

The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250302574/q...

The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250302574/q...

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