GCN Circular 27155
R. Hamburg (UAH), C. Meegan (UAH) and E. Bissaldi (Politecnico and INFN Bari) report on behalf of the Fermi GBM Team: "At 23:57:10.33 UT on 19 February 2020, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 200219C (trigger 603849435 / 200219998), which was also detected by Fermi-LAT (Dirirsa et al. 2020, GCN 27151). The Fermi GBM Final Real-time Localization (GCN 27145) is consistent with the LAT position. The GBM light curve shows a bright main peak followed by a weaker emission episode and has a duration (T90) of about 22 s (50-300 keV). The time-averaged spectrum from T0-0.00 s to T0+25.9 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -1.09 +/- 0.03 and the cutoff energy, parameterized as Epeak, is 199 +/- 9 keV. A Band function fits the spectrum equally well with Epeak = 181 +/- 12 keV, alpha = -1.05 +/- 0.03 and beta = -2.50 +/- 0.24. The event fluence (10-1000 keV) in this time interval is (1.87 +/- 0.04)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+3.7 s in the 10-1000 keV band is 24.8 +/- 0.4 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/"