Results from CALorimetric Electron Telescope (CALET) Observations of Gamma-rays on the International Space Station

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https://pos.sissa.it/444/708/

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https://doi.org/10.22323/1.444.0708
 http://hdl.handle.net/11603/36430

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UMBC Center for Space Sciences and Technology (CSST) / Center for Research and Exploration in Space Sciences & Technology II (CRSST II)
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https://orcid.org/0000-0003-2916-6955
 https://orcid.org/0000-0002-9247-3010

Date

2023-08-17

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conference papers and proceedings
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Citation of Original Publication

Adriani, Oscar, Yosui Akaike, Katsuaki Asano, Yoichi Aaoka, Eugenio Berti, Gabriele Bigongiari, Walter Robert Binns, et al. “Results from CALorimetric Electron Telescope (CALET) Observations of Gamma-Rays on the International Space Station.” In Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023), 444:708. SISSA Medialab, 2023. https://doi.org/10.22323/1.444.0708.

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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) cosmic ray detector on the International Space Station (ISS) has been in operation since its launch in 2015. The main instrument, the CALorimeter (CAL), is optimized to observe high-energy electrons up to TeV energies, but its three-storied, composite and thick detector enable us to discriminate gamma rays from overwhelming background of charged cosmic rays. Thus, it is monitoring the gamma ray sky from 1 GeV up to 10 TeV with a field of view of about 2 sr, but the exposure is somewhat non-uniform because of the limitation imposed by the inclination angle (51.6 degree) of the ISS orbit. In this paper we report results from gamma ray observations obtained during its mission for more than seven years with increased statistics compared with previous reports. They include properties of the Galactic diffuse gamma rays, spectra of bright Galactic point sources, and light curves of extragalactic active galactic nuclei, which show good consistencies with Fermi-LAT observations of which energy range overlaps with CALET.