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TITLE:   GCN CIRCULAR
NUMBER:  20363
SUBJECT: GRB 170102A: POLAR observation
DATE:    17/01/04 08:29:33 GMT
FROM:    Zhao Yi at POLAR  <yizhao@ihep.ac.cn>

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

At 2017-01-02T02:51:18.00 UT (T0), during a routine on-ground 
search of data, POLAR detected the GRB 170102A, 
which was also detected by the KONUS-Wind.

The POLAR light curve consists of multiple peaks,
with a duration (T90) of 40.03 s measured from T0-1.66 s.
The 1-s peak rate measured from T0+23.00 s is 335.7 cnts/s.
The total counts is about 4727 cnts. The above measurements
are in the energy range of about 80-500 keV.

LC_URL:
http://polar.ihep.ac.cn/grb/2017/01/GRB170102A/lc/POLAR_lc_grb170102A.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/.
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TITLE:   GCN CIRCULAR
NUMBER:  20368
SUBJECT: GRB 170102A: Astrosat CZTI detection
DATE:    17/01/05 10:51:34 GMT
FROM:    Vidushi Sharma at IUCAA  <vidushi@iucaa.in>

V. Sharma, V. Bhalerao (IUCAA) and D. Bhattacharya,  A. R. Rao (TIFR) and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:


Analysis of AstroSat CZTI data showed weak detection of GRB170102A (POLAR detection: Yi Zhao et al., GCN 20363) in the 40-200 keV energy range. 
The light curve shows multiple peak structure with stronger peak at 02:51:41 UT, 23 secs after POLAR trigger. The measured peak count rate is 
101.98 counts/sec above the background in combined data of four quadrants, with a total of 636.26 counts. The local mean background count rate
was 353 counts/sec.


CZTI GRB detections are reported regularly on the payload site at http://astrosat.iucaa.in/czti/?q=grb. CZTI is built by a TIFR-led consortium
of institutes across India, including VSSC, ISAC, IUCAA, SAC and PRL. The Indian Space Research Organisation funded, managed and facilitated
the project.