TITLE: GCN CIRCULAR NUMBER: 27383 SUBJECT: GRB 200313A: Fermi GBM detection DATE: 20/03/13 19:20:45 GMT FROM: Stephen Lesage at Fermi-GBM Team S. Lesage (UAH) and C. Meegan (UAH) report on behalf of the Fermi GBM Team: "At 01:41:36.62 UT on 13 March 2020, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 200313A (trigger 605756501 / 200313071). The location for this GRB was reported in the Fermi GBM Final Real-time Localization GCN (GCN 27374). The GBM light curve shows a single broad peak with a duration (T90) of about 13.6 s (50-300 keV). The time-averaged spectrum from T0 s to T0+22.5 s is best fit by a Band function with Epeak = 279 +/- 10 keV, alpha = -0.64 +/- 0.02, and beta = -1.84 +/- 0.02. The event fluence (10-1000 keV) in this time interval is (7.37 +/- 0.05)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+2.4 s in the 10-1000 keV band is 57.0 +/- 0.7 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog: https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html For Fermi GBM data and info, please visit the official Fermi GBM Support Page: https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/"