GCN Circular 19248

T. Tamura (Kanagawa 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, S. Torii (Waseda U), Y. Shimizu (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 160324A (INTEGRAL-ACS trigger #7431; Konus-Wind trigger time on 
15:58:32.877 UT) triggered the CALET Gamma-Ray Burst Monitor (CGBM) at 15:58:38.0 on 
24 March 2016.  No real time CGBM GCN notice was distributed about this trigger because 
the real time communication from the ISS was off (loss of signal) between 15:51 and 16:13.  
The burst signal was seen by SGM instrument.

The light curve of the SGM shows at least two main episodes with a possible low level 
emission before the first episode.  The low-level emission starts at T0-30 sec.  The 
first episode starts at T0-5 sec, peaks at T0-3 sec and ends at T0+5 sec.  The second 
episode starts at T0+6 sec, peaks at T0+8sec and ends at T0+14 sec.  The T90 duration 
measured by the SGM data is 42 +- 2 sec (40-450 keV). 

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