TITLE: GCN CIRCULAR NUMBER: 20271 SUBJECT: GRB 161210A: POLAR observation DATE: 16/12/16 06:21:33 GMT FROM: Zhengheng Li at POLAR Z. H. Li (IHEP), Y. H. Wang (IHEP), Y. Zhao (IHEP), M. Z. Feng(IHEP), J. C. Sun (IHEP), H. C. Li (IHEP), S. L. Xiong (IHEP), T. Batsch(NCBJ), T. Bernasconi (ISDC/UniGe), F. Cadoux (DPNC/UniGe), Y. W. Dong (IHEP), M. Y. Ge (IHEP),W.Hajdas (PSI),Y. Huang (IHEP), Karol Jedrzejczak (NCBJ), M. R. Kole (DPNC/UniGe), F. J. Lu (IHEP), R. Marcinkowski(PSI), M. Pohl (DPNC/UniGe), N. Produit (ISDC/UniGe),A. Rutczynska (NCBJ), D. Rybka (NCBJ),L. M. Song (IHEP), J. Szabelski (NCBJ), X. Wen (IHEP), B. B. Wu (IHEP),X. Wu (DPNC/UniGe), H. L. Xiao (PSI), M. Xu (IHEP), J. Zhang (IHEP),L. Y. Zhang (IHEP), P. Zhang (PSI), S. N. Zhang (IHEP), Y. J. Zhang (IHEP), A. Zwolinska (NCBJ) report for the POLAR collaboration: At 2016-12-10T12:33:54 UT (T0), during a routine on-ground  search of data, POLAR detected the GRB 161210A,  which was also detected by the Fermi/GBM (trigger 503066038/161210523). The POLAR light curve consists of a single peak, with a duration (T90) of 11.76 s measured from T0-0.10 s . The 1s peak rate measured from T0+0.00 s is 199.3 cnts/s, The total counts is about 1318 cnts. The above measurements are in the energy range of about 80-500 keV. LC_URL: http://polar.ihep.ac.cn/grb/2016/GRB161210A/lc/POLAR_lc_grb161210523.jpg Using the best location from the Fermi/GBM, which is (J2000): RA:   283.120   [deg] Dec:     +63.050 [deg] Err:     10.11 [deg] the incident angle in POLAR coordinate at T0 is: theta:  75.9  [deg] phi:   -23.6  [deg] The 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/html/