TITLE: GCN CIRCULAR NUMBER: 32782 SUBJECT: GRB 221016A: Fermi GBM observation DATE: 22/10/17 13:58:45 GMT FROM: Elisabetta Bissaldi at INFN,Bari elisabetta.bissaldi@ba.infn.it
E. Bissaldi (Politecnico and INFN Bari), P. Veres (UAH) and C. Meegan (UAH) report on behalf of the Fermi GBM Team:
"At 23:39:22.71 UT on 16 October 2022, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 221016A (trigger 687656367/221016986), which was also detected by the Swift/BAT (Page et al. GCN 32774). The Fermi GBM Final Real-time Localization (GCN 32773) is consistent with the Swift position.
The angle from the Fermi LAT boresight at the GBM trigger time is 98 degrees.
The GBM light curve shows a single emission episode with a duration (T90) of about 13 s (50-300 keV). The time-averaged spectrum from T0-1.2 s to T0+11 s is best fit by a Band function with Epeak = 119 +/- 12 keV, alpha = -0.51 +/- 0.12, and beta = -2.11 +/- 0.11.
The event fluence (10-1000 keV) in this time interval is (6.3 +/- 0.3)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+1.8 s in the 10-1000 keV band is 7.4 +/- 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/"