GCN Circular 27592
E. Bissaldi (Politecnico and INFN Bari) reports on behalf of the Fermi GBM Team: "At 07:05:17.38 UT on 16 April 2020, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 200416A (trigger 608713522 /200416295), which was also detected by the Swift/BAT (Evans et al. 2020, GCN 27591). The trigger was initially misclassified as a particle event by the flight software. The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight at the GBM trigger time is 92 degrees. The GBM light curve shows a double-peaked emission episode with a duration (T90) of about 9 s (50-300 keV). The time-averaged spectrum from T0-2 s to T0+6 s is adequately fit by a power law function with an exponential high-energy cutoff. The power law index is -0.87 +/- 0.15 and the cutoff energy, parameterized as Epeak, is 74 +/- 6 keV. The event fluence (10-1000 keV) in this time interval is (1.43 +/- 0.08)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0-0.064 s in the 10-1000 keV band is 6.5 +/- 0.3 ph/s/cm^2. A Band function fits the spectrum equally well with Epeak= 64 +/- 9 keV, alpha = -0.66 +/- 0.24 and beta = -2.5 +/- 0.3. 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/"