[vsnet-grb-info 19832] GRB 170906A CALET Gamma-Ray Burst Monitor detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  21884
SUBJECT: GRB 170906A CALET Gamma-Ray Burst Monitor detection
DATE:    17/09/15 04:28:50 GMT
FROM:    Takanori Sakamoto at AGU  <tsakamoto at phys.aoyama.ac.jp>

A. V. Penacchioni, 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), 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 170906A (Siegel et al., GCN Circ. 21821; Hamburg et al.,
GCN Circ. 21839; Tsvetkova et al., GCN Circ. 21859) triggered the CALET Gamma-ray
Burst Monitor (CGBM) at 00:43:05.59 on 6 September 2017.  The burst signal was
seen by the all CGBM instruments.

The light curve of the SGM shows a complex structure.  The emission starts at T0 sec
and the brightest pulse peaks at T+35 sec.  The entire emission ends at T+100 sec.
The T90 duration measured by the SGM data is 78.4 +- 1.9 sec (40-1000 keV).

The light curve is available at

http://cgbm.calet.jp/cgbm_trigger/flight/1188693801/

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