TITLE: GCN CIRCULAR NUMBER: 27478 SUBJECT: GRB 200402B: Fermi GBM Final Localization DATE: 20/04/02 17:36:11 GMT FROM: Peter Veres at UAH The Fermi GBM team reports the detection of a likely LONG GRB At 16:30:29.65 UT on 2 Apr 2020, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 200402B (trigger 607537834 / 200402688). This trigger was initially classified as a particle event by the flight software, but is in fact a GRB. The on-ground calculated location, using the Fermi GBM trigger data, is RA = 190.1, Dec = -6.6 (J2000 degrees, equivalent to J2000 12h 40m, -06d 36'), with a statistical uncertainty of 6.5 degrees. The angle from the Fermi LAT boresight is 88 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200402688/quicklook/glg_skymap_all_bn200402688.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/bn200402688/quicklook/glg_healpix_all_bn200402688.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200402688/quicklook/glg_lc_medres34_bn200402688.gif