{
  "bibcode": "2017GCN.21717....1P",
  "body": "S. Poolakkil (UAH) and C. Meegan (UAH)\nreport on behalf of the Fermi GBM Team:\n\n\"At 19:38:56.48 UT on 26 August 2017, the Fermi Gamma-Ray Burst Monitor\ntriggered and located GRB 170826B (trigger 525469141/ 170826819).\n\nThe on-ground calculated location, using the GBM trigger\ndata, is RA = 327.7, DEC = -31.8, 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 trigger resulted in an Autonomous Repoint Request (ARR)\nby the GBM Flight Software owing to the high fluence\nof the GRB. This ARR was accepted and the spacecraft slewed to the GBM\nin-flight\nlocation. The initial angle from the Fermi LAT boresight to\nthe GBM ground best location is 110 degrees.\n\nThe GBM light curve shows multiple overlapping pulses\nwith a duration (T90) of about 11 s (50-300 keV).\nThe time-averaged spectrum from T0-2.0 to T0+20.5 s is\nbest fit by a Band function with Epeak = 385 +/- 24 keV,\nalpha = -0.98 +/- 0.02, and beta = -2.24 +/- 0.10.\n\nThe event fluence (10-1000 keV) in this time interval is\n(3.592 +/- 0.052)E-05 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+4.0 s in the 10-1000 keV band\nis 25.4 +/- 0.5 ph/s/cm^2.\n\nThe spectral analysis results presented above are preliminary;\nfinal results will be published in the GBM GRB Catalog.\"\n\n-- \nSuraj Poolakkil\nFermi GBM Graduate Research Assistant\nDept. of Space Science\nUniversity of Alabama in Huntsville",
  "circularId": 21717,
  "createdOn": 1503798535000,
  "email": "sp0076@uah.edu",
  "subject": "GRB 170826B: Fermi GBM detection",
  "submitter": "Suraj Poolakkil at UAH  <sp0076@uah.edu>",
  "eventId": "GRB 170826B"
}