TITLE:   GCN CIRCULAR
NUMBER:  35258
SUBJECT: GRB 231204A: Fermi GBM Final Real-time Localization
DATE:    23/12/04 20:10:25 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 20:00:03 UT on 4 Dec 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 231204A (trigger 723412808.99994 / 231204833).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 324.4, Dec = 54.7 (J2000 degrees, equivalent to J2000 21h 37m, 54d 42'), with a statistical uncertainty of 2.4 degrees.

The angle from the Fermi LAT boresight is 19.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231204833/quicklook/glg_skymap_all_bn231204833.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/bn231204833/quicklook/glg_healpix_all_bn231204833.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231204833/quicklook/glg_lc_medres34_bn231204833.gif