//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 19671 SUBJECT: GRB 160628A CALET Gamma-Ray Burst Monitor detection DATE: 16/07/09 12:46:18 GMT FROM: Takanori Sakamoto at AGU I. Takahashi (IPMU), A. Yoshida, T. Sakamoto, Y. Kawakubo, M. Moriyama, 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 160628A (Fermi-GBM trigger #488814821; Konus-Wind trigger time on 13:53:41.910) triggered the CALET Gamma-ray Burst Monitor (CGBM) at 13:53:37.9 on 28 June 2016. The burst signal was only seen by the SGM instrument. The light curve of the SGM shows a double peak structure starting at T+0.1 sec and ending at T+6 sec. The peak times of the spikes are T+1 sec and T+3.5 sec. The T90 duration measured by the SGM data is 5.1 +- 0.9 sec (40-230 keV). The light curve is available at http://cgbm.calet.jp/cgbm_trigger/flight/1151157163/ The CALET data used in this analysis are provided by the Waseda CALET Operation Center located at the Waseda University.