[vsnet-grb-info 19288] GRB 170402A CALET Gamma-Ray Burst Monitor detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  20980
SUBJECT: GRB 170402A CALET Gamma-Ray Burst Monitor detection
DATE:    17/04/04 23:31:32 GMT
FROM:    Takanori Sakamoto at AGU  <tsakamoto at phys.aoyama.ac.jp>

T. Sakamoto, A. Yoshida, 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 170402A (Fermi GBM trigger #512808659;
Konus-Wind trigger time on 06:50:51.076) triggered the CALET
Gamma-ray Burst Monitor (CGBM) at 06:50:52.11 on 2 April 2017.
The burst signal was only seen by the SGM instrument.

The light curve of the SGM shows several peaks.  The entire
burst episode starts at T+2 sec and ends at T+12 sec.  Two bright
emissions peak at T+3 sec and T+5 sec.  The T90 duration measured
by the SGM data is 7.5 +- 0.6 sec (40-1000 keV).

The light curve is available at

http://cgbm.calet.jp/cgbm_trigger/flight/1175150695/

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