TITLE: GCN CIRCULAR NUMBER: 31740 SUBJECT: GRB 220311A: Fermi GBM Final Real-time Localization DATE: 22/03/11 16:43:54 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely LONG GRB At 16:33:18 UT on 11 Mar 2022, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 220311A (trigger 668709203.400826 / 220311690). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 131.1, Dec = 55.0 (J2000 degrees, equivalent to J2000 08h 44m, 55d 00'), with a statistical uncertainty of 18.6 degrees. The angle from the Fermi LAT boresight is 111.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220311690/quicklook/glg_skymap_all_bn220311690.png The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220311690/quicklook/glg_healpix_all_bn220311690.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220311690/quicklook/glg_lc_medres34_bn220311690.gif