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GCN Circular 20803

GRB 170228B CALET Gamma-Ray Burst Monitor detection
2017-03-03T06:13:49Z (7 years ago)
Takanori Sakamoto at AGU <>
P. S. Marrocchesi (U of Siena)  A. Yoshida, T. Sakamoto, Y. Kawakubo,
M. Moriyama, Y. Yamada (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),
and the CALET collaboration:

The long-duration GRB 170228B (Fermi GBM trigger #509999585;
Xiao et al, GCN Circ. 20792) triggered the CALET Gamma-ray Burst
Monitor (CGBM) at 18:32:58.03 on 28 February 2017.  The burst signal
was seen by the HXM2 and SGM instrument.

The light curve of the SGM shows two peaks.  The first peak starts at T0,
peaks at T+5 sec and ends at T+18 sec.  The second peak starts at T+20 sec,
peaks at T+25 sec and ends at T+35 sec.  The T90 duration measured by
the SGM data is 32.2 +- 1.2 sec (40-1000 keV).

The light curve is available at

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