TITLE:   GCN CIRCULAR
NUMBER:  19517
SUBJECT: GRB 160607A CALET Gamma-Ray Burst Monitor detection
DATE:    16/06/10 01:52:00 GMT
FROM:    Takanori Sakamoto at AGU  <tsakamoto@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 long-duration GRB 160607A (Swift, Ukwatta et al. GCN Circ. 19502; Konus-Wind
trigger time on 11:13:56.92 UT; INTEGRAL-ACS trigger #7487) triggered the CALET
Gamma-Ray Burst Monitor (CGBM) at 11:13:57.49 on 7 June 2016.   The burst signal
was seen by all CGBM instruments.

The light curve of the SGM shows a complex structure with multiple spikes.
The emission starts at T0 and ends at T0+30 sec.  The multiple spikes peak
at T0+2 sec, T0+4 sec, T0+7 sec, T0+11 sec,  T0+14 sec, T0+15 sec and T0+21 sec.
The T90 duration measured by the SGM data is 18.9 +- 2.9 sec (40-1000 keV).
The light curve is available at

http://cgbm.calet.jp/cgbm_trigger/flight/1149333220/

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