TITLE: GCN CIRCULAR NUMBER: 21255 SUBJECT: GRB 170614A CALET Gamma-Ray Burst Monitor detection DATE: 17/06/16 23:00:32 GMT FROM: Takanori Sakamoto at AGU I. Takahashi (IPMU), A. Yoshida, T. Sakamoto, Y. Kawakubo, M. Moriyama, Y. Yamada, A. Tezuka, S. Matsukawa (AGU), K. Yamaoka (Nagoya U), S. Nakahira (RIKEN), 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 170614A (Fermi-GBM trigger #519133191; INTEGRAL SPI-ACS trigger #7869; Konus-Wind trigger time on 11:39:55.892) triggered the CALET Gamma-ray Burst Monitor (CGBM) at 11:39:43.86 on 14 June 2017. The burst signal was seen by the all CGBM instruments. The light curve of the SGM shows multiple peaks. The entire burst episode starts at T+~2 sec, peaks at T+~20 sec and ends at T+~40 sec. The T90 duration measured by the SGM data is 22 +- 1 sec (40-1000 keV). The light curve is available at http://cgbm.calet.jp/cgbm_trigger/flight/1181475101/ The CALET data used in this analysis are provided by the Waseda CALET Operation Center located at the Waseda University.