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GCN Circular 18475

Subject
GRB 151006A: CALET Gamma-Ray Burst Monitor detection
Date
2015-10-27T00:49:24Z (9 years ago)
From
Takanori Sakamoto at AGU <tsakamoto@phys.aoyama.ac.jp>
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, T. Tamura (Kanagawa U), 
M. L. Cherry (LSU), S. Ricciarini (U of Florence) 
and the CALET collaboration:

The long-duration GRB 151006A (Kocevski et al., GCN Circ. 18398; Cummings  et al., 
GCN Circ. 18409; Roberts & Meegan, GCN Circ. 18404; Golenetskii et al., GCN Circ. 18413; 
Bhalerao et al., GCN Circ. 18422) triggered the CALET Gamma-Ray Burst Monitor (CGBM) 
at 09:54:59.97 UT on 6 October 2015.   The clear burst signal was detected by the Soft 
Gamma-ray Monitor (SGM; 30 keV - 20 MeV) which is a scintillation detector utilized a BGO 
crystal.  Due to a large incident angle of the event, no signal was detected by the Hard X-ray 
Monitor (HXM; 7 keV - 1 MeV) which is a scintillation detector composed of a LaBr3(Ce) crystal.  

The SGM light curve shows two spikes peaking at T0-2s and T0+2s, and the emission ending 
around T0+~60s.  The T90 duration measured by the SGM data is 63 +- 5 s (30 - 1000 keV).  

Currently, CALET is in the commissioning phase.  Further information about CALET and 
CGBM can be found at http://calet.jp/en/ and http://www.en.yoshida-agu.net/research/calet-gbm
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