TITLE:   GCN CIRCULAR
NUMBER:  38650
SUBJECT: GRB 241223A: Fermi GBM Final Real-time Localization
DATE:    24/12/23 12:19:24 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 12:08:46 UT on 23 Dec 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 241223A (trigger 756648531.631546 / 241223506).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 159.9, Dec = -34.8 (J2000 degrees, equivalent to J2000 10h 39m, -34d 47'), with a statistical uncertainty of 1.0 degrees.

The angle from the Fermi LAT boresight is 67.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241223506/quicklook/glg_skymap_all_bn241223506.png

The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241223506/quicklook/glg_healpix_all_bn241223506.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241223506/quicklook/glg_lc_medres34_bn241223506.gif