TITLE: GCN CIRCULAR NUMBER: 28557 SUBJECT: GRB 201004A: Fermi GBM Final Localization DATE: 20/10/04 13:23:10 GMT FROM: Andreas von Kienlin at MPE The Fermi GBM team reports the detection of a likely LONG GRB At 08:45:57.61 UT on 4 Oct 2020, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 201004A (trigger 623493962/ 201004365). This trigger was initially classified as Distant Particles event by the flight software, but is in fact a GRB. The on-ground calculated location, using the Fermi GBM trigger data, is RA = 30.1, Dec = 61.2(J2000 degrees, equivalent to J2000 2 h 00 m, 61 d 12'), with a statistical uncertainty of 4.3 degrees. The angle from the Fermi LAT boresight is 142 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201004365/q uicklook/glg_skymap_all_bn201004365.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/bn201004365/q uicklook/glg_healpix_all_bn201004365.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201004365/q uicklook/glg_lc_medres34_bn201004365.gif