[vsnet-grb-info 18554] GRB 160927A: CALET Gamma-Ray Burst Monitor ground detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  20002
SUBJECT: GRB 160927A: CALET Gamma-Ray Burst Monitor ground detection
DATE:    16/10/06 13:43:52 GMT
FROM:    Takanori Sakamoto at AGU  <tsakamoto at phys.aoyama.ac.jp>

M. Moriyama, A. Yoshida, T. Sakamoto, Y. Kawakubo, Y. Yamada (AGU),
K. Yamaoka (Nagoya U), S. Nakahira (JAXA), 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 short-duration GRB 160927A (Gibson et al., GCN Circ. 19952) was
detected by the ground analysis of the CALET Gamma-ray Burst Monitor
(CGBM) data at 18:04:49.88 on 27 September 2016.  The highest signal-to-noise
based on the light curve data is 5.3 sigma.  The burst signal was seen
by the SGM instrument.

The light curve of the SGM shows a single peak starting at T0, peaking
at T+0.4 sec and ending at T+0.6 sec.  The T90 duration measured by
the SGM data is 0.35 +- 0.11 sec (40-1000 keV).

The light curve is available at

http://cgbm.calet.jp/cgbm_trigger/flight/1159034645/

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