[vsnet-grb-info 18823] GRB 161207B: POLAR observation

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  20273
SUBJECT: GRB 161207B: POLAR observation
DATE:    16/12/16 12:51:22 GMT
FROM:    Feng Minzi at POLAR  <fengmz at ihep.ac.cn>

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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