TITLE:   GCN CIRCULAR
NUMBER:  22210
SUBJECT: GRB 171124A CALET Gamma-Ray Burst Monitor detection
DATE:    17/12/08 00:29:41 GMT
FROM:    Takanori Sakamoto at AGU  <tsakamoto@phys.aoyama.ac.jp>

A. Tezuka, A. Yoshida, T. Sakamoto, Y. Kawakubo, M. Moriyama, Y. Yamada,
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 171124A (Longo et al., GCN circ. 22156; Bissaldi et al.,
GCN circ. 22164; Sharma et al., GCN circ. 22168; Li et al., GCN circ. 22171) triggered
the CALET Gamma-ray Burst Monitor (CGBM) at 05:37:55.34 on 24 November 2017.
The burst signal was only seen by the SGM instrument.

The light curve of the SGM shows several peaks.  The emission starts
at T0, peaks at T+9 sec and ends at T+21 sec.  The T90 duration measured
by the SGM data is 17.8 +- 0.5 sec (40-1000 keV).

The light curve is available at

http://cgbm.calet.jp/cgbm_trigger/flight/1195536953/

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