////////////////////////////////////////////////////////////////////////
TITLE:   GCN CIRCULAR
NUMBER:  20246
SUBJECT: GRB 161207A: CALET Gamma-Ray Burst Monitor detection
DATE:    16/12/10 04:54:09 GMT
FROM:    Takanori Sakamoto at AGU  <tsakamoto@phys.aoyama.ac.jp>

S. Ozawa (Waseda U), A. Yoshida, T. Sakamoto, Y. Kawakubo, M. Moriyama,
Y. Yamada (AGU), K. Yamaoka (Nagoya U), S. Nakahira (JAXA), I. Takahashi (IPMU),
Y. Asaoka, S. Torii (Waseda U), Y. Shimizu, T. Tamura (Kanagawa U), W. Ishizaki (ICRR),
M. L. Cherry (LSU), S. Ricciarini (U of Florence), P. S. Marrocchesi (U of Siena)
and the CALET collaboration:

The long-duration GRB 161207A (Fermi-GBM trigger #502836132) triggered
the CALET Gamma-ray Burst Monitor (CGBM) at 20:43:00.39 on 7 December 2016.
The burst signal was seen by all CGBM instruments.

The light curve of the SGM shows several overlapping peaks.  The entire
burst episode starts at T-20 sec, peaks at T+5 sec and ends at T+30 sec.
The T90 duration measured by the SGM data is 32.8 +- 1.7 sec (40-1000 keV).

The light curve is available at

http://cgbm.calet.jp/cgbm_trigger/flight/1165178415/

The CALET data used in this analysis are provided by the Waseda
CALET Operation Center located at the Waseda University.

////////////////////////////////////////////////////////////////////////
TITLE:   GCN CIRCULAR
NUMBER:  20277
SUBJECT: GRB 161207A: POLAR observation
DATE:    16/12/17 04:32:48 GMT
FROM:    Yuanhao Wang at IHEP/CAS  <wangyuanhao@ihep.ac.cn>

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

At 2016-12-07T20:42:55 UT (T0), during a routine on-ground 
search of data, POLAR detected the GRB 161207A, 
which was also detected by the CALET (GCN Circ #20246) and Fermi/GBM
(trigger 502836132/161207863).

The POLAR light curve consists of several peaks,
with a duration (T90) of 27.4 s measured from T0-2.87 s .
The 1s peak rate measured from T0+19.00 s is 350.4 cnts/s,
The total counts is about 4946 cnts.  The above measurements are
in the energy range of about 80-500 keV.

LC_URL:

http://polar.ihep.ac.cn/grb/2016/GRB161207A/lc/POLAR_lc_grb161207862.jpg

Using the best location from the Fermi/GBM, which is (J2000):
RA:    305.020     [deg]
Dec:   +20.700     [deg]
Err:     4.69      [deg]

the incident angle in POLAR coordinate at T0 is:
theta:  65.4  [deg]
phi:   -28.6  [deg]

The 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/html/ .