On-orbit operation and gamma-ray burst observations with the CALET Gamma-ray Burst Monitor

Date

2019-04-15

Department

Program

Citation of Original Publication

Rights

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.
Public Domain Mark 1.0

Subjects

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.