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The CALorimetric Electron Telescope (CALET) on the International SpaceStation (ISS) consists of a high-energy cosmic ray CALorimeter (CAL) and alower-energy CALET Gamma ray Burst Monitor (CGBM). CAL is sensitive toelectrons up to 20 TeV, cosmic ray nuclei from Z = 1 through Z $\sim$ 40, andgamma rays over the range 1 GeV - 10 TeV. CGBM observes gamma rays from 7 keVto 20 MeV. The combined CAL-CGBM instrument has conducted a search for gammaray bursts (GRBs) since Oct. 2015. We report here on the results of a searchfor X-ray/gamma ray counterparts to gravitational wave events reported duringthe LIGO/Virgo observing run O3. No events have been detected that pass allacceptance criteria. We describe the components, performance, and triggeringalgorithms of the CGBM - the two Hard X-ray Monitors (HXM) consisting ofLaBr$_{3}$(Ce) scintillators sensitive to 7 keV to 1 MeV gamma rays and a SoftGamma ray Monitor (SGM) BGO scintillator sensitive to 40 keV to 20 MeV - andthe high-energy CAL consisting of a CHarge-Detection module (CHD), IMagingCalorimeter (IMC), and fully active Total Absorption Calorimeter (TASC). Theanalysis procedure is described and upper limits to the time-averaged fluxesare presented.

CALET Search for electromagnetic counterparts of gravitational waves during the LIGO/Virgo O3 run