GCN Circular 20273

M. Z. Feng (IHEP), Y. Zhao (IHEP), Y. H. Wang (IHEP), J. C. Sun (IHEP),
Z. H. Li (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 2016-12-07T05:22:44 UT (T0), during a routine on-ground 
search of data, POLAR detected the GRB 161207B, 
which was also detected by the Fermi/GBM (trigger 502780971/161207224).

The POLAR light curve consists of a single peak,
with a duration (T90) of 12.5 s measured from T0-0.94 s .
The 1s peak rate measured from T0+4.00 s is 151.3 cnts/s,
The total counts is about 713 cnts. The above measurements are
in the energy range of about 80-500 keV.

LC_URL: 
http://polar.ihep.ac.cn/grb/2016/GRB161207B/lc/POLAR_lc_grb161207224.jpg

Using the best location from the Fermi/GBM, which is (J2000):
RA:    294.810     [deg]
Dec:    -9.930     [deg]
Err:     18.01     [deg]

the incident angle in POLAR coordinate at T0 is:
theta:  60.7  [deg]
phi:   -66.0  [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/pub/.



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