TITLE:   GCN CIRCULAR
NUMBER:  21020
SUBJECT: GRB 170412A CALET Gamma-Ray Burst Monitor detection
DATE:    17/04/20 11:38:45 GMT
FROM:    Takanori Sakamoto at AGU  <tsakamoto@phys.aoyama.ac.jp>

M. Moriyama, A. Yoshida, T. Sakamoto, Y. Kawakubo, 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,
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 170412A (Fermi GBM trigger #513733380;
INTEGRAL SPI-ACS trigger #7811) triggered the CALET Gamma-ray Burst Monitor (CGBM)
at 23:42:54.53 on 12 April 2017.  The burst signal was seen by all CGBM instruments.

The light curve of the SGM shows a single peak starting at T0 sec,
peaking at T+3 sec and ending at T+35 sec.  The T90 duration measured
by the SGM data is 28.5 +- 1.2 sec (40-1000 keV).

The light curve is available at

http://cgbm.calet.jp/cgbm_trigger/flight/1176075398/

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