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GCN Circular 21002

Subject
GRB 170403B CALET Gamma-Ray Burst Monitor detection
Date
2017-04-08T01:07:38Z (7 years ago)
From
Takanori Sakamoto at AGU <tsakamoto@phys.aoyama.ac.jp>
Y. Kawakubo, A. Yoshida, T. Sakamoto, M. Moriyama, Y. Yamada (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 170403B (Fermi GBM trigger #512931458;
INTEGRAL SPI-ACS trigger #7799; Konus-Wind trigger time on
16:57:35.034) triggered the CALET Gamma-ray Burst Monitor (CGBM)
at 16:57:31.18 on 3 April 2017.  The burst signal was only seen by
the SGM instrument.

The light curve of the SGM shows a single peak starting at T0+2 sec,
peaking at T+5 sec and ending at T+10 sec.  The T90 duration measured
by the SGM data is 6.7 +- 0.4 sec (40-1000 keV).

The light curve is available at

http://cgbm.calet.jp/cgbm_trigger/flight/1175273491/

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