TITLE:   GCN CIRCULAR
NUMBER:  19792
SUBJECT: GRB 160804B: CALET Gamma-Ray Burst Monitor detection
DATE:    16/08/14 06:51:01 GMT
FROM:    Takanori Sakamoto at AGU  <tsakamoto@phys.aoyama.ac.jp>

W. Ishizaki (ICRR), A. Yoshida, T. Sakamoto, Y. Kawakubo, M. Moriyama,
Y. Yamada (AGU), K. Yamaoka (Nagoya U), S. Nakahira (JAXA), I. Takahashi (IPMU),
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 short-duration GRB 160804B (Fermi-GBM trigger #491977127)
triggered the CALET Gamma-ray Burst Monitor (CGBM) at 04:18:42.78
on 4 August 2016.  The burst signal was only seen by the SGM instrument.

The light curve of the SGM shows two short spikes.  The first peak starts
at T+0.4 s, peaks at T+0.45 s and ends at T+0.7 s.  The second spike
peaks at T+0.8 s with a duration of 0.1 s.  The T90 duration measured by
the SGM data is 0.41 +- 0.04 sec (100-1000 keV).

The light curve is available at

http://cgbm.calet.jp/cgbm_trigger/flight/1154319406/

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