{
  "bibcode": "2018GCN.22367....1S",
  "body": "M. Stanbro and C. Meegan (UAH)\nreport on behalf of the Fermi GBM Team:\n\n\"At 04:58:13.00 UT on 20 January 2018, the Fermi Gamma-Ray Burst Monitor\ntriggered and located GRB 180120A (trigger 538117098 / 180120207)\nwhich was also detected by the CALET Gamma-ray Burst Monitor\n(Y. Shimizu et al. 2018, GCN 22366).\n\nThe on-ground calculated location, using the GBM trigger\ndata, is RA = 151.77, DEC = 27.79, with an uncertainty\nof 1 degree (radius, 1-sigma containment,\nstatistical only; there is additionally a systematic\nerror which we have characterized as a core-plus-tail model, with 90% of\nGRBs having a 3.7 deg error and a small tail suffering a larger than 10 deg\nsystematic error. [Connaughton et al. 2015, ApJS, 216, 32].\n\nThe angle from the Fermi LAT boresight at the GBM trigger time is 85\ndegrees.\n\nThe GBM light curve consists of several episodes\nwith a duration (T90) of about 29 s (50-300 keV).\nThe time-averaged spectrum from T0+0.90 s to T0+30.59 s is\nbest fit by a Band function with Epeak = 130 +/- 2 keV,\nalpha = -1.05 +/- 0.01, and beta = -2.58 +/- 0.05.\n\nThe event fluence (10-1000 keV) in this time interval is\n(6.27 +/- 0.05)E-05 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+17.66 s in the 10-1000 keV band\nis 36.70 +/- 0.50 ph/s/cm^2.\n\nThe spectral analysis results presented above are preliminary;\nfinal results will be published in the GBM GRB Catalog.\"",
  "circularId": 22367,
  "createdOn": 1516746748000,
  "email": "mcs0001@uah.edu",
  "subject": "GRB 180120A: Fermi GBM Detection",
  "submitter": "Matthew Stanbro at UAH/Fermi  <mcs0001@uah.edu>",
  "eventId": "GRB 180120A"
}