TITLE:   GCN CIRCULAR
NUMBER:  20003
SUBJECT: GRB 161004B: CALET Gamma-Ray Burst Monitor detection
DATE:    16/10/06 13:51:35 GMT
FROM:    Takanori Sakamoto at AGU  <tsakamoto@phys.aoyama.ac.jp>

Y. Yamada, A. Yoshida, T. Sakamoto, Y. Kawakubo, M. Moriyama (AGU),
K. Yamaoka (Nagoya U), S. Nakahira (JAXA), 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), P. S. Marrocchesi (U of Siena)
and the CALET collaboration:

The long-duration GRB 161004B (D'Ai et al., GCN Circ. 19987; Kumar et al.,
GCN Circ. 19996;  Hamburg et al., GCN Circ. 19998; INTEGRAL-SPI/ACS trigger #7590)
triggered the CALET Gamma-ray Burst Monitor (CGBM) at 23:07:52.64 on 4 October 2016.
The burst signal was seen by the SGM instrument.

The light curve of the SGM shows a single peak starting at T0, peaking at
T+7 sec and ending at T+15 sec.  The T90 duration measured by the SGM data
is 11.1 +- 0.9 sec (40-450 keV).

The light curve is available at

http://cgbm.calet.jp/cgbm_trigger/flight/1159657616/

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