[vsnet-grb-info 17406] GRB 151231A: CALET Gamma-Ray Burst Monitor detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  18810
SUBJECT: GRB 151231A: CALET Gamma-Ray Burst Monitor detection
DATE:    16/01/03 08:07:31 GMT
FROM:    Takanori Sakamoto at AGU  <tsakamoto at phys.aoyama.ac.jp>

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

The long-duration GRB 151231A (Veres et al. GCN Circ. 18787) triggered the CALET 
Gamma-Ray Burst Monitor (CGBM) at 10:37:53.15 UT on 31 December 2015.  The 
clear burst signal was detected by all instruments.  

The light curve of the SGM shows two main peaks.  The first peak starts at T0-2 sec, 
peaks at T0 and ends at T0+5 sec.  The second peak starts at T0+50 sec, peaks at 
T0+60 sec and ends at T0+70 sec.  The T90 duration measured by the SGM data is 
66.0 +- 0.7 sec (40-1000 keV).  

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