GCN Circular 20331
Subject
GRB 161219B: POLAR Observation
Date
2016-12-22T10:38:13Z (8 years ago)
From
Haulin Xiao at PSI/POLAR <hualin.xiao@psi.ch>
Hualin Xiao (PSI), Wojtek Hajdas (PSI) and Radek Marcinkowski (PSI) report on behalf of the POLAR collaboration:
At 2016-12-19T18:48:39.0 UT(T0), during a routine on-ground search of data, POLAR detected the GRB 161219B,
which was also observed by Swift BAT (trigger #727541).
The POLAR light curve consists of one peak with duration (T90) of 4.0 +- 0.5 s measured from T0.
The 0.5 s peak flux at T0+1.75 s is equal to 248 +-44 cnts/sec.
Above measurements are in the energy range of about 80 - 500 keV.
LC_URL: http://polar.psi.ch/triggers/GRB161219B.png
and http://polar.psi.ch/pub/lc.php?event=GRB+161219B
Using the best location from the Swift BAT, which is (J2000):
RA: 91.717 [deg]
Dec: -26.790 [deg]
the incident angle in the POLAR coordinate at T0 is:
Theta: 96.6 [deg]
Phi: 201.2 [deg]
The analysis results presented above are preliminary. Calibration of the instrument is ongoing.
POLAR is a dedicated Gamma-Ray Burst polarimeter which was launched on-board the Chinese space
laboratory Tiangong-2 (TG-2) on Sep 15, 2016. The energy detection range of POLAR is ~ 50-500 keV.
More information about POLAR can be found at http://polar.psi.ch/pub , http://polar.ihep.ac.cn/en/ and http://isdc.unige.ch/polar/ .
This message is quotable in publications.