{
  "submitter": "Oliver J Roberts at USRA/NASA <oliver.roberts@nasa.gov>",
  "subject": "GRB 230506B: Fermi GBM detection",
  "eventId": "GRB 230506B",
  "circularId": 33758,
  "body": "O.J. Roberts (USRA/NASA-MSFC), S. Bala (USRA), C. Meegan (UAH)\nreport on behalf of the Fermi GBM Team:\n\n\"At 12:45:18.77 UT on 06 May 2023, the Fermi Gamma-Ray Burst Monitor (GBM)\ntriggered and located GRB 230506B (trigger 705069923 / 230506531), which was\nalso detected by the Swift/BAT (S. Dichiara et al. 2023, GCN 33729 and \nS.D. Barthelmy et al. 2023, GCN 33742). The GBM on-ground location is \nconsistent with the Swift position.\n\nThe angle from the Fermi LAT boresight at the GBM trigger time is 47 degrees.\n\nThe GBM light curve consists of multiple short bursts\nwith a duration (T90) of about 38 s (50-300 keV).\nThe time-averaged spectrum from T0-0.8 s to T0+39.2 s is best fit by\na power law function with an exponential\nhigh-energy cutoff. The power law index is -1.28 +/- 0.04 and\nthe cutoff energy, parameterized as Epeak, is 1767 +/- 576 keV\n\nThe event fluence (10-1000 keV) in this time interval is\n(1.13 +/- 0.04)E-05 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+10.4 s in the 10-1000 keV band\nis 8.1 +/- 0.3 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/\"",
  "bibcode": "2023GCN.33758....1R",
  "createdOn": 1683753589500
}