[vsnet-grb-info 18793] GRB 161203A: POLAR Detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  20243
SUBJECT: GRB 161203A: POLAR Detection
DATE:    16/12/08 15:21:23 GMT
FROM:    Merlin Kole at U of GenevaPOLAR  <merlin.kole at unige.ch>

M. Kole (DPNC/UniGe), N. Produit (ISDC/UniGe),  T. Bernasconi (ISDC/UniGe),
J. C. Sun (IHEP), Y. H. Wang (IHEP), S. L. Xiong (IHEP), Z. H. Li (IHEP),
H. C. Li (IHEP), Y. Zhao (IHEP), T. Batsch(NCBJ), F. Cadoux (DPNC/UniGe),
Y. W. Dong (IHEP), M. Z. Feng (IHEP), M. Y. Ge (IHEP), W. Hajdas (PSI),
Y. Huang (IHEP), Karol Jedrzejczak (NCBJ), F. J. Lu (IHEP), R. Marcinkowski
(PSI), M. Pohl (DPNC/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 he POLAR team:

During a routine on-ground search of data POLAR detected the GRB 161203A,

at 2016-12-03T18:41:07.75 UT(T0). This GRB was also observed by Konus-Wind,

INTEGRAL SPI/ACS (trigger #7641), CALET (GCN #20240) and Astrosat CZTI (GCN #20241).

The POLAR light curve consists two peaks with a total duration (T90)

of 4.75 +- 0.25 s measured from T0-0.5 s. The 250-ms peak flux of the

first peak, measured at T0+0.5 s is 1509 cnts/sec. The second stronger

peak measured at T0+3.0 s has a peak flux of 2821 cnts/sec. The

above measurements are in the preliminary calculated energy range

of about 80 - 500 keV.

LC_URL: http://www.isdc.unige.ch/polar/lc/161203A/lcr.png


The analysis results presented above are preliminary as the
instrument calibration is still ongoing.

Preliminary calculations of the MDP show that a
polarimetric measurement of this burst can be attempted.

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://isdc.unige.ch/polar/

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