TITLE: GCN CIRCULAR NUMBER: 21337 SUBJECT: GRB 170710D CALET Gamma-Ray Burst Monitor detection DATE: 17/07/14 01:05:56 GMT FROM: Takanori Sakamoto at AGU T. Tamura (Kanagawa U), A. Yoshida, T. Sakamoto, Y. Kawakubo, M. Moriyama, Y. Yamada, A. Tezuka, S. Matsukawa (AGU), K. Yamaoka (Nagoya U), S. Nakahira (RIKEN), I. Takahashi (IPMU), Y. Asaoka, S. Ozawa, S. Torii (Waseda U), Y. Shimizu (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 170710D (Konus-Wind trigger time on 19:12:50.635 UT) triggered the CALET Gamma-ray Burst Monitor (CGBM) at 19:12:50.84 on 10 July 2017. The burst signal was seen by the all CGBM instrument. The light curve of the SGM shows a bright single peak. The emission starts at T+2 sec, peaks at T+5 sec and ends at T+10 sec. The T90 duration measured by the SGM data is 4.9 +- 0.3 sec (40-1000 keV). The light curve is available at http://cgbm.calet.jp/cgbm_trigger/flight/1183748644/ The CALET data used in this analysis are provided by the Waseda CALET Operation Center located at the Waseda University. [GCN OPS NOTE(17jul17): Per author's request (Circ 21338), 170710C was changed to 170710D.]