{
  "bibcode": "2017GCN.20906....1X",
  "body": "H.L. Xiao (PSI), R. Marcinkowski (PSI)  and W. Hajdas (PSI) report on behalf of the POLAR collaboration:\n\nAt 2017-03-15 13:57:53.0 UT(T0), during a routine on-ground search of data, POLAR detected GRB 170315A,\nwhich was also observed by Fermi GBM (trigger # 511279081).\n\nThe POLAR light curve consists of multiple peaks with duration (T90) of 7.00 +/- 1.00 s measured from T0.\nThe 1.00 s peak flux at T0 + 4.50 s  is equal to 830 +/- 80 counts/sec.\nPOLAR recorded 3130 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_170315A_raw.png\n     or http://polar.psi.ch/pub/lc.php?event=GRB+170315A\n\nUsing the best location from Fermi GBM, which is (J2000):\nRA : 230.39 [deg]\nDec: 60.34 [deg]\nError: 9.18\nthe incident angle in the POLAR coordinate at T0 is:\nTheta: 49.83 [deg]\nPhi: 291.93 [deg]\n\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": 20906,
  "createdOn": 1489846148000,
  "email": "hualin.xiao@psi.ch",
  "subject": "GRB 170315A: POLAR observation",
  "submitter": "Haulin Xiao at PSI/POLAR  <hualin.xiao@psi.ch>",
  "eventId": "GRB 170315A"
}