//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 20274 SUBJECT: GRB 161213A: POLAR Observation DATE: 16/12/16 14:58:03 GMT FROM: Haulin Xiao at PSI/POLAR R. Marcinkowski, H. Xiao and W. Hajdas in the name of POLAR Collaboration At 2016-12-13T07:05:02 during a routine on-ground search of data, POLAR detected the GRB 161213A, which was also observed by the FERMI/GBM (trigger #503305506) and Integral/SPIACS (2016-12-13T07:05:02.85). The POLAR light curve consists of two main peaks with total duration of 7s. The 1s maximum peak flux is 370 +/- 50 cts/s (background subtracted). The total number of counts is 1360 +/- 140 (background subtracted). The above measurements are preliminary and estimated energy range is about 80 keV to 500 keV. LC_URL: http://polar.psi.ch/triggers/POLAR_GRB161213A.png The incident angle in POLAR detector coordinate is: theta: 46 [deg] phi: 245 [deg] This direction is computed using the best location from the FERMI/GBM, which is: RA: 238 [deg] Dec: 31 [deg] The analysis results presented above are preliminary. The calibration work is ongoing. POLAR is a dedicated Gamma-Ray Burst polarimeter which was launched on-board the Chinese space laboratory Tiangong-2 (TG-2) on Sep 15, 2016.The energy detection range of POLAR is ~ 50-500 keV