TITLE: GCN CIRCULAR NUMBER: 28080 SUBJECT: GRB 200711A: Fermi GBM detection DATE: 20/07/11 18:47:25 GMT FROM: Suraj Poolakkil at UAH S.Poolakkil (UAH), E. Bissaldi (Politecnico and INFN Bari) and C. Meegan (UAH) report on behalf of the Fermi GBM Team: "At 11:04:32.93 UT on 11 July 2020, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 200711A(trigger 616158277 / 200711461), which was also detected by the Swift/BAT (Marshall et al. 2020, GCN 28078). The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight at the GBM trigger time is 77 degrees. The GBM light curve consists of a single bright pulse followed by some extended emission with a duration (T90) of about 29 s (50-300 keV). The time-averaged spectrum from T0 s to T0+24.58 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -1.04 +/- 0.03 and the cutoff energy, parameterized as Epeak, is 287 +/- 18 keV. A Band function fits equally well, with Epeak = 215 +/- 23 keV, alpha = -0.95 +/- 0.05 and beta = -2.04 +/- 0.10. The event fluence (10-1000 keV) in this time interval is (1.510 +/- 0.042)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+3.64 s in the 10-1000 keV band is 16.3 +/- 0.3 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/"