TITLE: GCN CIRCULAR NUMBER: 40327 SUBJECT: GRB 250502C: Fermi GBM Final Localization DATE: 25/05/02 18:51:11 GMT FROM: eliza.neights@gmail.com

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

"At 07:23:59.29 UT on 02 May 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250502C (trigger 767863444/250502308).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 239.16, Dec = -47.34 (J2000 degrees, equivalent to J2000 15h 56m, -47d 20'), with a statistical uncertainty of 11.99 degrees.

The angle from the Fermi LAT boresight is 69 degrees.

The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250502308/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/bn250502308/q...

The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250502308/q..."

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