[vsnet-grb-info 18281] GRB 160720A CALET Gamma-Ray Burst Monitor detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  19729
SUBJECT: GRB 160720A CALET Gamma-Ray Burst Monitor detection
DATE:    16/07/23 02:03:16 GMT
FROM:    Takanori Sakamoto at AGU  <tsakamoto at phys.aoyama.ac.jp>

S. Ozawa (Wasoeda 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 160720A (Hamburg, et al., GCN circ. 19724;
Hurley, et al., GCN circ. 19726; Svinkin, et al. GCN circ. 19727;
Amelushkin, et al. GCN circ. 19728) triggered the CALET Gamma-ray
Burst Monitor (CGBM) at 18:25:16.38 on 20 July 2016.  No real time CGBM
GCN notice was distributed about this trigger because the real time
communication from the ISS was off (loss of signal) between 17:57 and
18:45.  The burst signal was seen by all CGBM instruments.

The light curve of the SGM shows two main peaks.  The emission starts at
T-5 sec and ends at T+30 sec.  The peak times of the main pulses are T+3 sec
and T+10 sec.  The 3rd weak peak is visible at T+18 sec.  The T90 duration
measured by the SGM data is 36.4 +- 1.7 sec (40-1000 keV).

The light curve is available at

http://cgbm.calet.jp/cgbm_trigger/flight/1153074224/

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