TITLE: GCN CIRCULAR NUMBER: 34197 SUBJECT: GRB 230707B: Fermi GBM Observation DATE: 23/07/10 20:00:51 GMT FROM: sumanbala2210@gmail.com S. Bala (USRA) and C. Meegan (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team: "At 18:46:20.29 UT on 07 July 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230707B (trigger 710448385/230707782). which was also detected by Swift/BAT-GUANO (James DeLaunay et al. 2023, GCN 34169) and CALET GBM (S. Torii et al. 2023, GCN 34189). The Fermi GBM Final Real-time Localization was reported at GCN 34165. The angle from the Fermi LAT boresight is 83 degrees. The GBM light curve is long and consists of many peaks with a duration (T90) of 99.6 s (50-300 keV). The time-averaged spectrum from T0-2.3 to T0+117.5 s is best fit by a Band function with Epeak = 143 +/- 5 keV, alpha = -0.63 +/- 0.04, and beta = -2.15 +/- 0.05. The event fluence (10-1000 keV) in this time interval is (5.4 +/- 0.1)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+80 s in the 10-1000 keV band is 5.3 +/- 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/" --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...