TITLE: GCN CIRCULAR NUMBER: 39741 SUBJECT: GRB 250316A: Fermi GBM Final Real-time Localization DATE: 25/03/16 09:10:17 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 08:59:57 UT on 16 Mar 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250316A (trigger 763808402.691648 / 250316375).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 208.7, Dec = 24.2 (J2000 degrees, equivalent to J2000 13h 54m, 24d 11'), with a statistical uncertainty of 10.2 degrees.

The angle from the Fermi LAT boresight is 94.0 degrees.

The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250316375/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/bn250316375/q...

The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250316375/q...

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