TITLE: GCN CIRCULAR NUMBER: 19165 SUBJECT: GRB 160307A: CALET Gamma-Ray Burst Monitor detection of a possible short GRB DATE: 16/03/11 10:11:33 GMT FROM: Takanori Sakamoto at AGU S. Torii (Waseda U), A. Yoshida, T. Sakamoto, I. Takahashi, Y. Kawakubo, K. Senuma, M. Moriyama, Y. Yamada (AGU), K. Yamaoka (Nagoya U), S. Nakahira (JAXA), Y. Asaoka, S. Ozawa (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: A possible short-duration GRB160307A (trigger #1141348444) triggered the CALET Gamma-Ray Burst Monitor (CGBM) at 01:18:34.96 on 7 March 2016. The burst signal was detected by SGM instrument. The light curve of the SGM shows a single peak. The emission starts and peaks at T0-0.3 sec and ends at T0+0.2 sec. The T90 duration measured by the SGM data is 0.4 +- 0.2 sec (40-1000 keV). Identification of this possible short event by other spacecraft is strongly encouraged. The CGBM data used in this analysis are provided by the Waseda CALET Operation Center located at the Waseda University.