[vsnet-grb-info 19593] GRB 170708B CALET Gamma-Ray Burst Monitor detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  21336
SUBJECT: GRB 170708B CALET Gamma-Ray Burst Monitor detection
DATE:    17/07/14 01:02:13 GMT
FROM:    Takanori Sakamoto at AGU  <tsakamoto at phys.aoyama.ac.jp>

Y. Shimizu (Kanagawa U), A. Yoshida, T. Sakamoto, Y. Kawakubo, M. Moriyama,
Y. Yamada, A. Tezuka, S. Matsukawa (AGU), K. Yamaoka (Nagoya U),
S. Nakahira (RIKEN), I. Takahashi (IPMU), Y. Asaoka, S. Ozawa, S. Torii (Waseda U),
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 170708B (Konus-Wind trigger time on
20:37:00.639 UT) triggered the CALET Gamma-ray Burst Monitor (CGBM)
at 20:36:54.18 on 8 July 2017.  The burst signal was only seen by the SGM
instrument.

The light curve of the SGM shows a single peak.  The emission starts at T+2 sec,
peaks at T+4 sec and ends at T+9 sec.  The T90 duration measured by the SGM
data is 5.6 +- 0.7 sec (40-1000 keV).

The light curve is available at

http://cgbm.calet.jp/cgbm_trigger/flight/1183580890/

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