{
  "bibcode": "2016GCN.20288....1W",
  "body": "Y. H. Wang (IHEP), Z. H. Li (IHEP), S. L. Xiong (IHEP) \nreport for the POLAR collaboration:\n\nAt��2016-12-18T08:32:41.341��UT��(T0),��during��a��routine��on-ground��\nsearch��of��data,��POLAR��detected the GRB 161218B,��which��was��also\ndetected��by��the Fermi/GBM (trigger 503742764/161218356).\n\nThe��POLAR��light��curve��consists��of��multiple��peaks,\nwith��a��duration��(T90) of��26.28��s��measured��from��T0+1.0��s .\nThe��1s��peak��rate��measured��from��T0+1.25��s��is��9849��cnts/s,\nThe��total��counts��is��about��29340 cnts.The��above��measurements��are\nin��the��energy��range��of��about��80-500��keV.\n\nThe preliminary estimation of minimum detectable polarization(MDP) \nis 36.8%[3-sigma, statistical only]. Follow-up observations are \nstrongly encouraged.\n\nLC_URL:\nhttp://polar.ihep.ac.cn/grb/2016/GRB161218B/lc/POLAR_lc_grb161218356.png\n\nUsing��the��best��location��from��the��Fermi/GBM,��which��is��(J2000):\nRA:    358.640     [deg]\nDec:   -16.950     [deg]\nErr:     1.00      [deg]\n\nthe��incident��angle��in��POLAR��coordinate��at��T0��is:\ntheta:�� 77.7612 ��[deg]\nphi: ����252.239�� [deg]\n\nThe��analysis��results��presented��above��are��preliminary.\n\nPOLAR is a dedicated Gamma-Ray Burst polarimeter (50-500 keV) on-board \nthe Chinese space laboratory Tiangong-2 launched on Sep 15, 2016. More \ninformation about POLAR can be found at http://polar.ihep.ac.cn/en/, \nhttp://isdc.unige.ch/polar/ and http://polar.psi.ch/html/",
  "circularId": 20288,
  "createdOn": 1482087882000,
  "email": "wangyuanhao@ihep.ac.cn",
  "subject": "GRB 161218B: POLAR observation",
  "submitter": "Yuanhao Wang at IHEP/CAS  <wangyuanhao@ihep.ac.cn>",
  "eventId": "GRB 161218B"
}