GCN Circular 20271

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/