TITLE: GCN CIRCULAR NUMBER: 35253 SUBJECT: The Fermi GBM team reports the detection of a likely SHORT GRB DATE: 23/12/03 22:30:35 GMT FROM: Bagrat Mailyan at Florida Tech mbagrat@gmail.com

At 19:56:04 UT on 3 Dec 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 231203B (trigger 723326169/ 231203831). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 197.3, Dec = +42.54 (J2000 degrees, equivalent to J2000 13h 09m, 42d 32'), with a statistical uncertainty of 15.9 degrees. The angle from the Fermi LAT boresight is 17.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231203831/q... The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231203831/q... The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231203831/q...

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