TITLE:   GCN CIRCULAR
NUMBER:  18701
SUBJECT: GRB 151210B: CALET Gamma-Ray Burst Monitor detection
DATE:    15/12/16 04:50:04 GMT
FROM:    Takanori Sakamoto at AGU  <tsakamoto@phys.aoyama.ac.jp>

T. Sakamoto, A. Yoshida, I. Takahashi, Y. Kawakubo, K. Senuma, 
M. Moriyama, 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 151210B (Fermi-GBM trigger #471401960) triggered the CALET 
Gamma-Ray Burst Monitor (CGBM) at 00:59:20.12 UT on 10 December 2015.  The burst 
was detected by all three CGBM instruments.  

The light curve of the Soft Gamma-ray Monitor (SGM; 30 keV - 20 MeV) shows the main 
peak starting from T0-3 sec, peaking at T0 and ending at T0+~40 sec.   
The T90 duration measured by the SGM data is 39 +- 3  sec (40-460 keV).  

Currently, CALET is in the commissioning phase.  Further information about CALET and 
CGBM can be found at http://calet.jp/en/ and http://www.en.yoshida-agu.net/research/calet-gbm