TITLE: GCN CIRCULAR NUMBER: 34199 SUBJECT: GRB 230709C: Fermi GBM Detection DATE: 23/07/10 20:12:24 GMT FROM: Peter Veres at University of Alabama in Huntsville <veresp@gmail.com> P. Veres and C. Meegan (both UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team: "At 17:38:26.82 UT on 09 July 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230709C (trigger 710617111/230709735). The on-ground calculated location, using the Fermi GBM trigger data (GCN #34198) is consistent with the location reported by Preis et al., GCN #34187. The GBM light curve consists of a single emission episode with a duration (T90) of about 0.19 s (50-300 keV). The time-averaged spectrum from T0-0.06 to T0+0.19 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.01 +/- 0.07 and the cutoff energy, parameterized as Epeak, is 1050 +/- 50 keV. The event fluence (10-1000 keV) in this time interval is (6.3 +/- 0.1)E-06 erg/cm^2. The 64-ms peak photon flux measured starting from T0+0.0 s in the 10-1000 keV band is 58 +/- 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...