GCN Circular 35576

V. Sharma (NASA-GSFC/UMBC) and R. Hamburg (CNRS/IN2P3) report on behalf of the Fermi Gamma-ray Burst Monitor Team:

At 17:23:23.93 UT on 18 January 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240118C (trigger 727291408/240118725).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 305.33, Dec = -12.39 (J2000 degrees, equivalent to J2000 20h 21m, 12d 23'), with a statistical uncertainty of 1.8 degrees.

The angle from the Fermi LAT boresight is 90.00 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240118725/quicklook/glg_skymap_all_bn240118725.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/bn240118725/quicklook/glg_healpix_all_bn240118725.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240118725/quicklook/glg_lc_medres34_bn240118725.gif