We present the analysis methodology and preliminary results of the gamma-ray event analy-
sis using the CALorimetric Electron Telescope (CALET). CALET, a 30 radiation length deep
calorimeter, was deployed aboard the International Space Station (ISS) in August 2015. In this
work we demonstrate the sensitivity of CALET to gamma-rays, the efficiency of separation be-
tween gamma-ray and charged particle events, and CALET’s exposure on the sky after the first
17 months of observation. Consistency of the flux of the bright sources Geminga and the Crab
with established Fermi-LAT results is discussed and initial results of a search for high-energy
counterparts to CALET Gamma-ray Burst Monitor gamma-ray bursts are presented.