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Abstract
The CALorimetric Electron Telescope (CALET) is a high-energy astroparticle physics space experiment installed on the International Space Station (ISS), developed and operated by Japan in collaboration with Italy and the United States. The CALET mission goals include the investigation of possible nearby sources of high-energy electrons, of the details of galactic particle acceleration and propagation, and of potential signatures of dark matter. CALET measures the cosmic-ray electron+positron flux up to 20 TeV, gamma-rays up to 10 TeV, and nuclei with Z=1 to 40 up to 1, 000 TeV for the more abundant elements during a long-term observation aboard the ISS. Starting science operation in mid-October 2015, CALET performed continuous observation without major interruption with close to 20 million triggered events over 10 GeV per month. Based on the data taken during the first two-years, we present an overview of CALET observations: 1) Electron+positron energy spectrum, 2) Nuclei analysis, 3) Gamma-ray observation including a characterization of on-orbit performance. Results of the electromagnetic counterpart search for LIGO/Virgo gravitational wave events are discussed as well.
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Details
1 Waseda Research Institute for Science and Engineering, Waseda University, Japan; JEM Utilization Center, Human Spaceflight Technology Directorate, Japan Aerospace Exploration Agency, Japan
2 Department of Physics, University of Florence, Italy; INFN Sezione di Florence, Italy
3 Department of Physics, University of Maryland, USA; Astroparticle Physics Laboratory, NASA/GSFC, USA
4 Institute for Cosmic Ray Research, The University of Tokyo, Japan
5 Department of Physical Sciences, Earth and Environment, University of Siena, Italy; INFN Sezione di Pisa, Italy
6 Department of Physics, Washington University, USA
7 Heliospheric Physics Laboratory, NASA/GSFC, USA
8 Department of Physics and Astronomy, Louisiana State University, USA
9 Institute of Applied Physics (IFAC), National Research Council (CNR), Italy
10 Department of Physics and Astronomy, University of Padova, Italy; INFN Sezione di Padova, Italy
11 University of Rome “Tor Vergata”, Italy; INFN Sezione di Rome “Tor Vergata”, Italy
12 Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Japan
13 Department of Physics, University of Maryland, USA; CRESST and Astroparticle Physics Laboratory NASA/GSFC, USA
14 Waseda Research Institute for Science and Engineering, Waseda University, Japan
15 Kanagawa University, Japan
16 Faculty of Science and Technology, Graduate School of Science and Technology, Hirosaki University, Japan
17 Yukawa Institute for Theoretical Physics, Kyoto University, Japan
18 National Institute of Polar Research, Japan
19 Faculty of Engineering, Division of Intelligent Systems Engineering, Yokohama National University, Japan
20 Faculty of Science, Shinshu University, Japan
21 Hakubi Center, Kyoto University, Japan; Department of Astronomy, Graduate School of Science, Kyoto University, Japan
22 College of Science and Engineering, Department of Physics and Mathematics, Aoyama Gakuin University, Japan
23 High Energy Accelerator Research Organization, Japan
24 CRESST and Astroparticle Physics Laboratory NASA/GSFC, USA; Department of Physics, University of Maryland, USA
25 INFN Sezione di Pisa, Italy
26 University of Pisa, Italy; INFN Sezione di Pisa, Italy
27 Astroparticle Physics Laboratory, NASA/GSFC, USA
28 Department of Electrical and Electronic Systems Engineering, National Institute of Technology, Ibaraki College, Japan
29 Department of Astronomy, University of Maryland, College Park, Maryland 20742, USA; CRESST and Astroparticle Physics Laboratory NASA/GSFC, USA
30 Waseda Research Institute for Science and Engineering, Waseda University, Japan; Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Japan
31 Department of Physical Sciences, College of Science and Engineering, Ritsumeikan University, Japan
32 INFN Sezione di Florence, Italy
33 Global Center for Science and Engineering, Waseda University, Japan
34 RIKEN, Japan
35 Department of Physics and Astronomy, University of Denver, USA
36 Department of Physics, University of Florence, Italy; Institute of Applied Physics (IFAC), National Research Council (CNR), Italy; INFN Sezione di Florence, Italy
37 Department of Physical Sciences, Earth and Environment, University of Siena, Italy; ASI Science Data Center (ASDC), Italy
38 Institute of Applied Physics (IFAC), National Research Council (CNR), Italy; INFN Sezione di Florence, Italy
39 CRESST and Astroparticle Physics Laboratory NASA/GSFC, USA; Department of Astronomy, University of Maryland, College Park, Maryland 20742, USA
40 College of Industrial Technology, Nihon University, Japan
41 Department of Physics, University of Florence, Italy
42 Kavli Institute for the Physics and Mathematics of the Universe, The University of Tokyo, Japan
43 Waseda Research Institute for Science and Engineering, Waseda University, Japan; School of Advanced Science and Engineering, Waseda University, Japan
44 Division of Mathematics and Physics, Graduate School of Science, Osaka City University, Japan
45 National Institutes for Quantum and Radiation Science and Technology, JAPAN
46 Nagoya University, Japan
47 College of Science, Ibaraki University, Japan
48 Department of Electronic Information Systems, Shibaura Institute of Technology, Japan