TITLE: GCN CIRCULAR NUMBER: 28809 SUBJECT: GRB 201029A: Fermi GBM detection DATE: 20/10/30 14:40:58 GMT FROM: Peter Veres at UAH P. Veres and C. Meegan (both UAH) report on behalf of the Fermi GBM Team: "At 20:19:51.61 UT on 29 October 2020, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 201029A (trigger 625695596 / 201029847) which was also detected by the Swift/BAT (Dichiara et al., GCN 28803). The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight at the GBM trigger time is 59 degrees. The GBM light curve consists of a broad peak with a duration (T90) of about 78 s (50-300 keV). The time-averaged spectrum from T0-8.2 s to T0+34.8 s is adequately fit by a power law function with an exponential high-energy cutoff. The power law index is -1.03 +/- 0.10 and the cutoff energy, parameterized as Epeak, is 647 +/- 230 keV. The event fluence (10-1000 keV) in this time interval is (1.59 +/- 0.14)E-5 erg/cm^2. The 1-sec peak photon flux measured starting from T0+1.4 s in the 10-1000 keV band is 1.4 +/- 0.2 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/"