GCN Circular 34162
P. Veres and C. Meegan (both UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team: "At 03:22:51.96 UT on 07 July 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230707A (trigger 710392976/230707141), which was also detected by the Swift/BAT-GUANO (Tohuvavohu et al. 2023, GCN 34159). The Fermi GBM Final Real-time Localization (GCN 34156) is consistent with the Swift position. The angle from the Fermi LAT boresight is 63 degrees. The GBM light curve consists of multiple pulses with a duration (T90) of about 29 s (50-300 keV). The time-averaged spectrum from T0-2.8 to T0+30.0 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.77 +/- 0.08 and the cutoff energy, parameterized as Epeak, is 121 +/- 7 keV. The event fluence (10-1000 keV) in this time interval is (6.9 +/- 0.2)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+1.5 s in the 10-1000 keV band is 6.5 +/- 0.3 ph/s/cm^2. A Band function fits the spectrum equally well with Epeak= 110 +/- 10 keV, alpha = -0.7 +/- 0.1 and beta = -2.5 +/- 0.2. 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/"