TITLE:   GCN CIRCULAR
NUMBER:  35252
SUBJECT: GRB 231203A: Fermi GBM Final Real-time Localization
DATE:    23/12/03 07:11:59 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 07:01:30 UT on 3 Dec 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 231203A (trigger 723279695.772024 / 231203293).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 239.7, Dec = -49.8 (J2000 degrees, equivalent to J2000 15h 58m, -49d 47'), with a statistical uncertainty of 7.1 degrees.

The angle from the Fermi LAT boresight is 59.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231203293/quicklook/glg_skymap_all_bn231203293.png

The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231203293/quicklook/glg_healpix_all_bn231203293.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231203293/quicklook/glg_lc_medres34_bn231203293.gif