{
  "createdOn": 1683930829421,
  "bibcode": "2023GCN.33785....1B",
  "body": "S. Bala (USRA), O.J. Roberts (USRA/NASA-MSFC), B. Mailyan (Florida Tech) and C. Meegan (UAH)\nreport on behalf of the Fermi GBM Team:\n\n\"At 06:27:45.00 UT on 12 May 2023, the Fermi Gamma-Ray Burst Monitor (GBM)\ntriggered and located GRB 230512A (trigger 705565670 /230512269), which was also\ndetected by the Fermi/LAT (D. J. Maheso et al. 2023, GCN 33780).\n\nThe Fermi GBM Final Real-time Localization (GCN 33778) is consistent with the LAT position.\n\nThe angle from the Fermi LAT boresight at the GBM trigger time is 45 degrees.\n\nThe GBM light curve consists of multiple short peaks\nwith a duration (T90) of about 3 s (50-300 keV).\nThe time-averaged spectrum from T0-0.064 s to T0+2.944 s is\nbest fit by a power law function with an exponential\nhigh-energy cutoff. The power law index is -0.67 +/- 0.02 and\nthe cutoff energy, parameterized as Epeak, is 1344 +/- 69 keV\n\nThe event fluence (10-1000 keV) in this time interval is\n(1.33 +/- 0.02)E-05 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+1.54 s in the 10-1000 keV band\nis 16.8 +/- 0.3 ph/s/cm^2.\n\nA Band function fits the spectrum equally well\nwith Epeak= 1215 +/- 79 keV, alpha = -0.65 +/- 0.03 and beta = -2.7 +/- 0.2.\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/\"\n\n\n",
  "submitter": "Oliver J Roberts at USRA/NASA <oliver.roberts@nasa.gov>",
  "circularId": 33785,
  "subject": "GRB 230512A: Fermi GBM detection",
  "eventId": "GRB 230512A"
}