CALET Gamma-ray Burst Monitor (CGBM)

Kazutaka Yamaoka, Nagoya University
Atsumasa Yoshida, Aoyama Gakuin University
Takanori Sakamoto, Aoyama Gakuin University
Ichiro Takahashi, Aoyama Gakuin University
Takumi Hara, Aoyama Gakuin University
Tatsuma Yamamoto, Aoyama Gakuin University
Yuta Kawakubo, Aoyama Gakuin University
Ryota Inoue, Aoyama Gakuin University
Shunsuke Terazawa, Aoyama Gakuin University
Rie Fujioka, Aoyama Gakuin University
Kazumasa Senuma, Aoyama Gakuin University
Satoshi Nakahira, JAXA Institute of Space and Astronautical Science
Hiroshi Tomida, JAXA Institute of Space and Astronautical Science
Shiro Ueno, JAXA Institute of Space and Astronautical Science
Shoji Torii, Waseda University
Michael L. Cherry, Louisiana State University
Sergio Ricciarini, Istituto Di Fisica Applicata Nello Carrara


The CALET Gamma-ray Burst Monitor (CGBM) is the secondary scientific instrument of the CALET mission on the International Space Station (ISS), which is scheduled for launch by H-IIB/HTV in 2014. The CGBM provides a broadband energy coverage from 7 keV to 20 MeV, and simultaneous observations with the primary instrument Calorimeter (CAL) in the GeV - TeV gamma-ray range and Advanced Star Camera (ASC) in the optical for gamma-ray bursts (GRBs) and other X-gamma-ray transients. The CGBM consists of two kinds of scintillators: two LaBr3(Ce) (7 keV - 1 MeV) and one BGO (100 keV - 20 MeV) each read by a single photomultiplier. The LaBr3(Ce) crystal, used in space for the first time here for celestial gamma-ray observations, enables GRB observations over a broad energy range from low energy X-ray emissions to gamma rays. The detector performance and structures have been verified using the bread-board model (BBM) via vibration and thermal vacuum tests. The CGBM is currently in the development phase of the proto-flight model (PFM) and the pre-flight calibration of the CGBM is planned for August 2013. In this presentation, we report on the current status and expected performance of CGBM for GRB observations.