TITLE:   GCN CIRCULAR
NUMBER:  35170
SUBJECT: GRB 231123B: Fermi GBM Final Real-time Localization
DATE:    23/11/23 19:35:41 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 19:25:21 UT on 23 Nov 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 231123B (trigger 722460326.50637 / 231123809).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 160.4, Dec = -68.9 (J2000 degrees, equivalent to J2000 10h 41m, -68d 54'), with a statistical uncertainty of 6.1 degrees.

The angle from the Fermi LAT boresight is 104.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231123809/quicklook/glg_skymap_all_bn231123809.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/bn231123809/quicklook/glg_healpix_all_bn231123809.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231123809/quicklook/glg_lc_medres34_bn231123809.gif