//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 20664 SUBJECT: GRB 170208C: POLAR Observation DATE: 17/02/12 01:08:15 GMT FROM: Zhao Yi at POLAR Yi Zhao (IHEP), Yuanhao Wang (IHEP), Hancheng Li (IHEP) report on behalf of the POLAR collaboration: At 2017-02-08T13:16:33.00 UT (T0), during a routine on-ground search of data, POLAR detected the GRB 170208C, which was also detected by the Fermi/GBM (trigger 508252598/170208553) and INTEGRAL/SPIACS (trigger 7684). The POLAR light curve consists of multiple peaks, with a duration (T90) of 47.87 s measured from T0+2.15 s. The 1-s peak rate measured from T0+47.00 s is 1842.1 cnts/s. The total counts is about 20354 cnts. The above measurements are in the energy range of about 20-500 keV. LC_URL: http://polar.ihep.ac.cn/grb/2017/02/GRB170208C/lc/POLAR_lc_grb170208C.png Using the best location from the Fermi/GBM, which is (J2000): RA: 284.420 [deg] Dec: -0.110 [deg] Err: 2.52 [deg] the incident angle in POLAR coordinate at T0 is: theta: 93.2 [deg] phi: -50.0 [deg] All analysis results presented above are preliminary. POLAR is a dedicated Gamma-Ray Burst polarimeter (50-500 keV) on-board the Chinese space laboratory Tiangong-2 launched on Sep 15,2016. More information about POLAR can be found at http://polar.ihep.ac.cn/en/ , http://isdc.unige.ch/polar/ and http://polar.psi.ch/pub/.