TITLE: GCN CIRCULAR NUMBER: 35412 SUBJECT: GRB 231222A: Fermi GBM Final Real-time Localization DATE: 23/12/22 07:20:32 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 07:09:54 UT on 22 Dec 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 231222A (trigger 724921799.613468 / 231222299).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 161.4, Dec = -36.0 (J2000 degrees, equivalent to J2000 10h 45m, -36d 00'), with a statistical uncertainty of 1.2 degrees.

The angle from the Fermi LAT boresight is 91.0 degrees.

The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231222299/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/bn231222299/q...

The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231222299/q...

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