[vsnet-grb-info 19540] GRB 170626B CALET Gamma-Ray Burst Monitor detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  21282
SUBJECT: GRB 170626B CALET Gamma-Ray Burst Monitor detection
DATE:    17/06/29 06:12:38 GMT
FROM:    Takanori Sakamoto at AGU  <tsakamoto at phys.aoyama.ac.jp>

Y. Asaoka (Waseda 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), 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 170626B (Liu et al., GCN Circ. 21265; Konus-Wind
trigger time on 00:58:02.21 UT) triggered the CALET Gamma-ray Burst
Monitor (CGBM) at 00:57:56.28 on 26 June 2017.  The burst signal was
seen by the all CGBM instruments.

The light curve of the SGM shows two overlapping peaks.  The emission
starts at T+1 sec, peaks at T+2.5 sec (the first peak) and T+5.5 sec
(the second peak), and ends at T+10 sec.  The T90 duration measured by
the SGM data is 5.0 +- 0.4 sec (40-1000 keV).

The light curve is available at

http://cgbm.calet.jp/cgbm_trigger/flight/1182473374/

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