[vsnet-grb-info 18906] GRB 161228C: POLAR observation
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Tue Jan 3 11:07:37 JST 2017
TITLE: GCN CIRCULAR
NUMBER: 20357
SUBJECT: GRB 161228C: POLAR observation
DATE: 17/01/03 02:06:49 GMT
FROM: Zhao Yi at POLAR <yizhao at ihep.ac.cn>
Yi Zhao (IHEP), Yuanhao Wang (IHEP) and Zhengheng Li (IHEP)
report on behalf of the POLAR collaboration:
At 2016-12-28T00:46:20.00 UT (T0), during a routine on-ground
search of data, POLAR detected the GRB 161228C,
which was also detected by the Fermi/GBM (trigger504578783/161228032).
The POLAR light curve consists of multiple peaks,
with a duration (T90) of 31.67 s measured from T0-6.29 s.
The 1-s peak rate measured from T0+16.00 s is 327.9 cnts/s.
The total counts is about 4408 cnts.The above measurements
arein the energy range of about 80-500 keV.
LC_URL:
http://polar.ihep.ac.cn/grb/2016/GRB161228C/lc/POLAR_lc_grb161228032.jpg
Using the best location from the Fermi/GBM, which is (J2000):
RA: 115.820 [deg]
Dec: +25.760 [deg]
Err: 3.14 [deg]
The incident angle in POLAR coordinate at T0 is:
theta: 52.2 [deg]
phi: -75.6 [deg]
All 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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