TITLE: GCN CIRCULAR NUMBER: 39782 SUBJECT: GRB 250319A: Fermi GBM Final Localization DATE: 25/03/19 15:14:51 GMT FROM: rhamburg@usra.edu

The Fermi GBM team reports the detection of a likely LONG GRB

"At 04:52:59.46 UT on 19 March 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250319A (trigger 764052784/250319203).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 335.24, Dec = -62.32 (J2000 degrees, equivalent to J2000 22h 21m, -62d 19'), with a statistical uncertainty of 6.84 degrees.

The angle from the Fermi LAT boresight is 25 degrees.

The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250319203/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/bn250319203/q...

The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250319203/q..."

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