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GCN Circular 22111

Subject
GRB 171102A CALET Gamma-Ray Burst Monitor detection
Date
2017-11-09T00:46:12Z (7 years ago)
From
Takanori Sakamoto at AGU <tsakamoto@phys.aoyama.ac.jp>
Y. Kawakubo, A. Yoshida, T. Sakamoto, 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), A. V. Penacchioni, P. S. Marrocchesi (U of Siena)
and the CALET collaboration:

The long-duration GRB 171102A (Yassine et al., GCN circ. 21615;
Stanbro et al., GCN circ. 22083; Kozlova et al., GCN circ. 22091;
Tsvetkova et al., GCN circ. 22094; INTEGRAL SPI-ACS trigger #7955) triggered
the CALET Gamma-ray Burst Monitor (CGBM) at 02:33:36.14 on 2 November 2017.
The burst signal was seen by the all CGBM instruments.  Because of a problem
in one of the ground alert processing script, the GCN notice was not distributed
automatically for this event.

The light curve of the SGM shows a complex structure with a precursor around
T0.  The precursor emission starts at T-2 sec and ends at T+2 sec.  The main burst
episode starts at T+30 sec, peaks at T+48 sec and ends at T+60 sec.  The T90
duration measured by the SGM data is 21.9 +- 0.3 sec (40-1000 keV).

The light curve is available at

http://cgbm.calet.jp/cgbm_trigger/flight/1193625133/

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