TITLE:   GCN CIRCULAR
NUMBER:  35111
SUBJECT: GRB 231118B: Fermi GBM Final Real-time Localization
DATE:    23/11/18 22:44:35 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 22:34:14 UT on 18 Nov 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 231118B (trigger 722039659.86232 / 231118940).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 348.9, Dec = 33.6 (J2000 degrees, equivalent to J2000 23h 15m, 33d 36'), with a statistical uncertainty of 1.0 degrees.

The angle from the Fermi LAT boresight is 83.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231118940/quicklook/glg_skymap_all_bn231118940.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/bn231118940/quicklook/glg_healpix_all_bn231118940.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231118940/quicklook/glg_lc_medres34_bn231118940.gif