Calet: Calorimetric electron telescope

The CALorimetric Electron Telescope CALET is collecting science data continuously since mid October 2015 on the JEM-EF external platform of the International Space Station. Equipped with a thick (30 X0, 1.3 λI) calorimeter,comprised of a finely segmented 3 X0 pre-shower section with excellent imaging capabilities followed by a 27 X0 total absorption homogeneous calorimeter,and with two independent subsystems to identify the charge of the incidentparticle, CALET provides an excellent energy and angular resolution and electron/proton discrimination of order 10-5. In addition to its primary goal ofa direct measurement of the electron spectrum in the poorly known energyregion above 1 TeV, CALET is carrying out extensive measurements of the energy spectra, relative abundances and secondary-to-primary ratios of elementsfrom proton to iron and above (up to atomic number Z=40).A brief overview of CALET observations is presented, based on the datataken during the first two-years. It includes the direct measurement of theelectron+positron energy spectrum, preliminary spectra of cosmic-ray nuclei,gamma-ray observations and the search of an e.m. counterpart of LIGO/VirgoGW events. © 2018 Istituto Nazionale di Fisica Nucleare. All rights reserved.