TITLE: GCN CIRCULAR NUMBER: 32412 SUBJECT: GRB 220715B: Fermi GBM detection DATE: 22/07/16 23:23:20 GMT FROM: Suraj Poolakkil at UAH O.J. Roberts (USRA), S. Poolakkil (UAH) and C.Meegan (UAH) report on behalf of the Fermi GBM Team: "At 22:24:42.74 UT on 15 July 2022, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 220715B (trigger 679616687 / 220715934), which was also detected by the Swift/BAT (E. Troja et al. 2022, GCN 32405) The Fermi GBM Final Real-time Localization (GCN 32404) is consistent with the Swift position. The angle from the Fermi LAT boresight at the GBM trigger time is 69 degrees. The GBM light curve consists of multiple peaks with a duration (T90) of about 40 s (50-300 keV). The time-averaged spectrum from T0-1.024 s to T0+43.008 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -1.09 +/- 0.23 and the cutoff energy, parameterized as Epeak, is 118 +/- 28 keV. The event fluence (10-1000 keV) in this time interval is (2.2 +/- 0.3)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0-0.8 s in the 10-1000 keV band is 2.5 +/- 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/"