[vsnet-grb-info 18956] GRB 170112B: POLAR observation

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  20460
SUBJECT: GRB 170112B: POLAR observation
DATE:    17/01/15 06:28:51 GMT
FROM:    Wen Xing at POLAR  <wenxing at ihep.ac.cn>

Xing Wen (IHEP), Yi Zhao (IHEP) and Hancheng Li (IHEP)
report on behalf of the POLAR collaboration:

At 2017-01-12T23:16:09.00 UT (T0), during a routine on-ground 
search of data, POLAR detected the GRB 170112B, 
which was also detected by the 
Fermi/GBM (trigger 505955774/170112970).

The POLAR light curve consists of a single peak,
with a duration (T90) of 13.54 s measured from T0-0.06 s.
The 1-s peak rate measured from T0+0.00 s is 509.0 cnts/s.
The total counts is about 1970 cnts. The above measurements
are in the energy range of about 80-500 keV.

LC_URL:
http://polar.ihep.ac.cn/grb/2017/01/GRB170112B/lc/POLAR_lc_grb170112B.jpg

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/.