[vsnet-grb-info 19287] GRB 170330A CALET Gamma-Ray Burst Monitor detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  20979
SUBJECT: GRB 170330A CALET Gamma-Ray Burst Monitor detection
DATE:    17/04/04 23:27:52 GMT
FROM:    Takanori Sakamoto at AGU  <tsakamoto at phys.aoyama.ac.jp>

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

The long-duration GRB 170330A (D'Avanzo et al. GCN Circ. 20944;
Sharma et al. GCN Circ. 20969; Kozlova et al. GCN Circ. 20974) triggered
the CALET Gamma-ray Burst Monitor (CGBM) at 22:27:27.91 on 30 March 2017.
The burst signal was seen by all CGBM instruments.

The light curve of the SGM shows several peaks.  The bright burst episode
starts at T-5 sec and ends at T+20 sec.  Two late time emissions at T+120 s
and T+150 s, which triggered Swift/BAT, are barely visible in the HXM data.
The T90 duration measured by the SGM data is 18.5 +- 2.4 sec (40-1000 keV).

The light curve is available at

http://cgbm.calet.jp/cgbm_trigger/flight/1174947694/

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