On-orbit operation and gamma-ray burst observations with the CALET Gamma-ray Burst Monitor
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2019-04-15
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This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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Abstract
The CALorimetric Electron Telescope (CALET) includes a Gamma-ray Burst Monitor (CGBM) to enhance the gamma-ray observations of the calorimeter, the main CALET detector. CGBM consists of two kinds of scintillation detectors, the Hard X-ray Monitor (HXM) consisting of LaBr3(Ce) and the Soft Gamma-ray Monitor (SGM) consisting of BGO. Together, the two detectors cover the X-ray/gamma-ray energy range 7 keV - 20 MeV. CGBM has observed gamma-ray bursts (GRBs) since October 2015. So far, CGBM has detected ~140 GRBs. The fraction of long and short GRBs are ~90% and ~10%. In this paper, we describe the current operational status of CGBM, the GRB analysis results including temporal and spectral analysis, and the search for gravitational wave counterparts.