[vsnet-grb-info 20189] GRB 171212A CALET Gamma-Ray Burst Monitor detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  22285
SUBJECT: GRB 171212A CALET Gamma-Ray Burst Monitor detection
DATE:    17/12/26 02:21:16 GMT
FROM:    Takanori Sakamoto at AGU  <tsakamoto at phys.aoyama.ac.jp>

K. Yamaoka (Nagoya U), A. Yoshida, T. Sakamoto, V. Pal'shin, Y. Kawakubo,
M. Moriyama, Y. Yamada, A. Tezuka, S. Matsukawa (AGU), 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 171212A (Konus-Wind trigger time on 22:53:41.759)
triggered the CALET Gamma-ray Burst Monitor (CGBM) at 22:53:37.68 on
12 December 2017.  The burst signal was seen only by the SGM instrument.

The light curve of the SGM shows two weak pulses.  The emission starts
at T0, peaks at T+0.5 sec and ends at T+30 sec.  The T90 duration measured
by the SGM data is 27.2 +- 3.6 sec (40-1000 keV).  The T50 duration measured
by the SGM data is 18.1 +- 4.5 sec (40-1000 keV).

The ground processed light curve is available at

http://cgbm.calet.jp/cgbm_trigger/ground/1197154263/

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