GCN Circular 32830
S. Poolakkil (UAH) and C. Meegan (UAH) report on behalf of the Fermi GBM Team: "At 22:55:48.91 UT on 22 October 2022, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 221022B (trigger 688172153 / 221022955, GCN 32820) which was also detected by the Swift/BAT- GUANO (Raman et al. 2022, GCN 32823). The angle from the Fermi LAT boresight at the GBM trigger time is 93 degrees. The GBM light curve consists of a single peak followed by some extended emission with a duration (T90) of about 32 s (50-300 keV). The time-averaged spectrum from T0+7.17 s to T+46.08 s is best fit by Band function, with Epeak = 265 +/- 6 keV, alpha = -0.61 +/- 0.02 and beta = -2.61 +/- 0.10. The event fluence (10-1000 keV) in this time interval is (7.14 +/- 0.07)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+22.3 s in the 10-1000 keV band is 34.3 +/- 0.5 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/"