TITLE: GCN CIRCULAR NUMBER: 29183 SUBJECT: GRB 201228A: Fermi GBM Final Real-time Localization DATE: 20/12/28 02:37:48 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely LONG GRB At 02:27:30 UT on 28 Dec 2020, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 201228A (trigger 630815255.731822 / 201228102). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 303.4, Dec = 32.3 (J2000 degrees, equivalent to J2000 20h 13m, 32d 17'), with a statistical uncertainty of 15.4 degrees. The angle from the Fermi LAT boresight is 44.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201228102/quicklook/glg_skymap_all_bn201228102.png The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201228102/quicklook/glg_healpix_all_bn201228102.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201228102/quicklook/glg_lc_medres34_bn201228102.gif