{
  "bibcode": "2023GCN.33440....1M",
  "body": "C. Malacaria (ISSI) reports on behalf of the Fermi GBM Team:\n\n\"At 13:32:27.40 UT on 8 March 2023, the Fermi Gamma-Ray Burst Monitor\ntriggered and located GRB 230308A (trigger 699975152 / 230308564).\nThe Fermi GBM Final Real-time Localization was reported in GCN 33420.\n\nThe angle from the Fermi LAT boresight at the GBM trigger time is 42 degrees.\n\nThe GBM light curve consists of a slightly structured main peak\nwith a duration (T90) of about 0.6 s (50-300 keV).\nThe time-averaged spectrum from T0-0.064 s to T0+0.64 s\nis best fit by a power law function with an exponential high-energy cutoff.\nThe power law index is -0.52 +/- 0.03 and the cutoff energy,\nparameterized as Epeak, is 943 +/- 46 keV.\n\nA Band function fits the spectrum equally well\nwith Epeak= 907 +/- 52 keV, alpha = -0.51 +/- 0.03,\nbeta = -3.1 +/- 0.4 .\n\nThe event fluence (10-1000 keV) in this time interval is\n(8.5 +/- 0.2)E-06  erg/cm^2. The 0.064-sec peak photon flux measured\nstarting from T0 in the 10-1000 keV band\nis 72 +/- 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/\"",
  "circularId": 33440,
  "createdOn": 1678376120000,
  "email": "oliver.roberts@nasa.gov",
  "subject": "GRB 230308A: Fermi GBM detection",
  "submitter": "Oliver J Roberts at USRA/NASA  <oliver.roberts@nasa.gov>",
  "eventId": "GRB 230308A"
}