{
  "bibcode": "2020GCN.27558....1M",
  "body": "B. Mailyan (Institute for Basic Science, South Korea) and R. Hamburg (UAH)\nreport on behalf of the Fermi GBM Team:\n\n\"At 09:08:40.71 UT on 12 April 2020, the Fermi Gamma-Ray Burst Monitor (GBM)\ntriggered and located GRB 200412B (trigger 608375325 / 200412381),\nwhich was also detected by the Fermi LAT (Longo et al. 2020, GCN 27557)\nand observed to have a candidate optical afterglow by MASTER\n(GCN 27555 & GCN 27556). The GBM on-ground location is consistent\nwith the LAT position.\n\nThe angle from the Fermi LAT boresight at the GBM trigger time is 59\ndegrees.\n\nThe GBM light curve shows a multi-peaked structure\nwith a duration (T90) of about 6 s (50-300 keV).\nThe time-averaged spectrum from T0+3.1s to T0+21.5 s is\nbest fit by a Band function with Epeak = 257 +/- 4 keV,\nalpha = -0.54 +/- 0.01, and beta = -2.24 +/- 0.02.\n\nThe event fluence (10-1000 keV) in this time interval is\n(8.00 +/- 0.04)E-05 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+9.1 s in the 10-1000 keV band\nis 127.5 +/- 0.7 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\nPage:\nhttps://fermi.gsfc.nasa.gov/ssc/data/access/gbm/\"",
  "circularId": 27558,
  "createdOn": 1586712196000,
  "email": "rkh0007@uah.edu",
  "subject": "GRB 200412B: Fermi GBM detection",
  "submitter": "Rachel Hamburg at UAH  <rkh0007@uah.edu>",
  "eventId": "GRB 200412B"
}