Atmospheric Cherenkov Gamma-ray Telescopes

The stereoscopicimaging atmospheric Cherenkov technique, developed in the 1980s and 1990s, is now used by a number of existing and planned gamma-rayobservatories around the world. It provides the most sensitive view of the very high energy gamma-raysky (above 30 GeV), coupled with relatively good angular and spectral resolutionover a wide field-of- view. This Chapter summarizes the details of the technique, including descriptions of the telescope optical systems and cameras, as well as the most common approaches to data analysis and gamma-rayreconstruction.