TITLE: GCN CIRCULAR NUMBER: 28706 SUBJECT: GRB 201020A: Fermi GBM observation DATE: 20/10/20 21:02:13 GMT FROM: Christian Malacaria at NASA-MSFC/USRA E. Bissaldi (Politecnico and INFN Bari), C. Malacaria (NASA-MSFC/USRA) and C. Meegan (UAH) report on behalf of the Fermi GBM Team: "At 05:47:45.18 UT on 20 October 2020, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 201020A (trigger 624865670 / 201020241), which was also detected by the Swift/BAT (Ambrosi et al. 2020, GCN 28696). The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight at the GBM trigger time is 66 degrees. The GBM light curve shows a single emission episode with a duration (T90) of about 22 s (50-300 keV). The time-averaged spectrum from T0-10.2s to T0+10.2 s is best fit by a simple power law function with index -1.83 +/- 0.04. The event fluence (10-1000 keV) in this time interval is (2.47 +/- 0.17)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0-3.6 s in the 10-1000 keV band is 3.48 +/- 0.14 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/"