TITLE: GCN CIRCULAR NUMBER: 28646 SUBJECT: GRB 201016A: Fermi GBM detection DATE: 20/10/16 05:23:45 GMT FROM: Joshua Wood at MSFC/Fermi-GBM J. Wood (NASA/MSFC) and C. Meegan (UAH) report on behalf of the Fermi GBM Team: "At 00:27:49.59 UT on 16 October 2020, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 201016A (trigger 624500874 / 201016019). The on-ground calculated location, using the GBM trigger data, is RA = 174.3, DEC = -2.0 (J2000 degrees, equivalent to 11h 37m, -2d 00'), with an uncertainty of 1.0 degrees (radius, 1-sigma containment, statistical only; there is additionally a systematic error which we have characterized as a mixture of two Gaussians, one with a radius of 1.8 degrees (52% contribution) and one with a radius of 4.1 degrees (47% contribution) [A. Goldstein et al. 2020, ApJ, 895, 1] ). The angle from the Fermi LAT boresight at the GBM trigger time is 93 degrees. The GBM light curve consists of multiple pulses with a duration (T90) of about 3 s (50-300 keV). The time-averaged spectrum from T0+6.3 s to T0+9.4 s is best fit by a Band function with Epeak = 181 +/- 2 keV, alpha = -0.42 +/- 0.01, and beta = -2.75 +/- 0.03 The event fluence (10-1000 keV) in this time interval is (9.06 +/- 0.04)E-05 erg/cm^2. The 1.024-sec peak photon flux measured starting from T0+6.8 s in the 10-1000 keV band is 267.4 +/- 1.1 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/"