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IACT
IACT stands for Imaging Atmospheric (or Air) Cherenkov Telescope or Technique. It is a device or method to detect very high energy gamma-ray photons in the 50 GeV to 50 TeV range. There are currently three operating IACT systems: H.E.S.S., MAGIC, and VERITAS. Currently under design is the Cherenkov Telescope Array (CTA). == Background ==
Due to the rapidly falling flux of gamma-ray photons from cosmic sources in this energy regime, space-based detectors become ineffective due to their small collection areas which are often limited to some tens or hundreds of square centimeters. In the case of the IACT, the Earth's atmosphere is used as the detection medium, implying a collection area of many hundreds of square meters. This enables IACT instruments to detect gamma-ray photons in an energy regime inaccessible to space-based instruments.
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