{
  "bibcode": "2017GCN.20922....1X",
  "body": "H.L. Xiao (PSI), W. Hajdas (PSI) and R. Marcinkowski (PSI)  report on behalf of the POLAR collaboration:\n\nAt 2017-03-17 09:45:56.0 UT(T0), during a routine on-ground search of data, POLAR detected GRB 170317A\n(Swift BAT (trigger # 742866); LaPorte et al., GCN 20885).\n\n\nThe POLAR light curve consists of one peak with duration (T90) of 6.00 � 1.00 s measured from T0.\nThe 1.00 s peak flux at T0 + 5.50 s  is equal to 370 � 50 counts/sec.\nPOLAR recorded 1500 events from the burst.\nAbove measurements are in the energy range of about 15 - 300 keV.\n\nLC_URL: http://polar.psi.ch/triggers/GRB_170317A.png\n\nUsing the best location from Swift-BAT, which is (J2000):\nRA : 93.087 [deg]\nDec: 50.500 [deg]\nthe incident angle in the POLAR coordinate at T0 is:\nTheta: 81.38 [deg]\nPhi: 4.61 [deg]\n\nThe analysis results presented above are preliminary. POLAR is a dedicated Gamma-Ray Burst polarimeter which was launched on-board the Chinese space\nlaboratory Tiangong-2 (TG-2) on Sep 15, 2016. The energy detection range of POLAR is ~ 50-500 keV.\nMore information about POLAR can be found at http://polar.psi.ch/pub ,\nhttp://polar.ihep.ac.cn/en/ and http://isdc.unige.ch/polar/ .\n\nThis message is quotable in publications.",
  "circularId": 20922,
  "createdOn": 1489950755000,
  "email": "hualin.xiao@psi.ch",
  "subject": "GRB 170317A: POLAR observation",
  "submitter": "Haulin Xiao at PSI/POLAR  <hualin.xiao@psi.ch>",
  "eventId": "GRB 170317A"
}