{
  "bibcode": "2017GCN.21238....1H",
  "body": "R. Hamburg (UAH), C. Meegan (UAH), and E. Bissaldi (Politecnico & INFN Bari)\nreport on behalf of the Fermi GBM Team:\n\n\"At 22:41:58.95 UT on 07 June 2017, the Fermi Gamma-Ray Burst Monitor\ntriggered and located GRB 170607B (trigger 518568123 / 170607946)\nwhich was also detected by the AstroSat CZTI\n(Sharma et al. 2017, GCN 21232).\n\nThe on-ground calculated location, using the GBM trigger\ndata, is RA = 257.1, DEC = -35.7, with an uncertainty\nof 1.5 degrees (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 99\ndegrees.\n\nThe GBM light curve consists of a spiked structure\nwith a duration (T90) of about 18 s (50-300 keV).\nThe time-averaged spectrum from T0-5.1 s to T0+22.5 s is\nbest fit by a power law function with an exponential\nhigh-energy cutoff.  The power law index is -0.77 +/- 0.02 and\nthe cutoff energy, parameterized as Epeak, is 627 +/- 21 keV.\n\nThe event fluence (10-1000 keV) in this time interval is\n(5.9 +/- 0.1)E-05 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+20.4 s in the 10-1000 keV band\nis 12.0 +/- 0.4 ph/s/cm^2.\n\nA Band function fits the spectrum equally well\nwith Epeak= 619 +/- 22 keV, alpha = -0.76 +/- 0.02 and beta =\n-3.5 +/- 0.7.\n\nThe spectral analysis results presented above are preliminary;\nfinal results will be published in the GBM GRB Catalog.\"",
  "circularId": 21238,
  "createdOn": 1497036427000,
  "email": "rkh0007@uah.edu",
  "subject": "GRB 170607B: Fermi GBM detection",
  "submitter": "Rachel Hamburg at UAH  <rkh0007@uah.edu>",
  "eventId": "GRB 170607B"
}