{
  "body": "O.J. Roberts (USRA/NASA-MSFC) and C. Meegan (UAH)\nreport on behalf of the Fermi Gamma-ray Burst Monitor Team:\n\n\"At 03:09:32.88 UT on 11 September 2023, the\nFermi Gamma-ray Burst Monitor (GBM) triggered and located\nGRB 230911A (trigger 716094577/230911132), which was also\ndetected by Swift/XRT (P. D'Avanzo et al. 2023, GCN 34702)\nand GOTO (S. Belkin et al. 2023, GCN 34681). The Fermi GBM\nFinal Real-time Localization reported in GCN 34652 is\nconsistent with the Swift-XRT and GOTO localizations.\n\nThe angle from the Fermi LAT boresight is 54 degrees.\n\nThe GBM light curve consists of a single peak with a\nduration (T90) of about 36 s (50-300 keV). The time-averaged\nspectrum from T0-4 to T0+30 s is best fit by a Band function\nwith Epeak= 98 +/- 21 keV, alpha = -1.1 +/- 0.1 and\nbeta = -2.0 +/- 0.1.\n\nThe event fluence (10-1000 keV) in this time interval is\n(6.2 +/- 0.3)E-06 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+2.0 s in the 10-1000 keV band is 3.7 +/- 0.2 ph/s/cm^2.\n\nThe spectral analysis results presented above are preliminary;\nfinal results will be published in the GBM GRB Catalog:\nhttps://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html\n\nFor Fermi GBM data and info, please visit the official Fermi GBM Support Page:\nhttps://fermi.gsfc.nasa.gov/ssc/data/access/gbm/\"",
  "subject": "GRB 230911A: Fermi GBM Observation",
  "bibcode": "2023GCN.34720....1R",
  "submittedHow": "web",
  "submitter": "Oliver J Roberts at USRA/NASA <oliver.roberts@nasa.gov>",
  "eventId": "GRB 230911A",
  "circularId": 34720,
  "createdOn": 1694910478723
}