{
  "circularId": 34249,
  "createdOn": 1690207222808,
  "subject": "GRB 230723B: Fermi GBM observation",
  "submitter": "Joe Mangan at IJCLab <joseph.mangan@ijclab.in2p3.fr>",
  "bibcode": "2023GCN.34249....1M",
  "eventId": "GRB 230723B",
  "body": "J.Mangan (CNRS/IJCLab) and C. Meegan (UAH) report on behalf of the Fermi GBM Team:\n\nAt 11:42:33.03 UT on 23 July 2023, the Fermi Gamma-Ray Burst Monitor (GBM)\ntriggered and located GRB 230723B (trigger 711805358 / 230723488),\nwhich was also detected by Swift BAT (K. L. Page et al. 2023, GCN 34234).\nThe Fermi GBM on-ground location is consistent with the Swift BAT position.\n\nThe angle from the Fermi LAT boresight at the GBM trigger time is 78 degrees.\n\nThe GBM light curve consists of a single peak\nwith a duration (T90) of about 10 s (50-300 keV).\nThe time-averaged spectrum from T0-2 s to T0+9 s is\nbest fit by a power law function with an exponential\nhigh-energy cutoff. The power law index is -0.9 +/- 0.1 and\nthe cutoff energy, parameterized as Epeak, is 59.1 +/- 2.7 keV.\n\nThe event fluence (10-1000 keV) in this time interval is\n(3.8 +/- 0.2)E-06 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+1.2 s in the 10-1000 keV band\nis 7.8 +/- 0.4 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/"
}