Very-high-energy gamma ray

Such energy levels have been detected from emissions from astronomical sources such as some binary star systems containing a compact object.

A flux of 10−7 photons per square meter per second can be detected with current technology, provided the energy is above 0.1 TeV.

[3] Instruments include the planned Cherenkov Telescope Array, GT-48 in Crimea, MAGIC on La Palma, High Energy Stereoscopic System (HESS) in Namibia[6] VERITAS[7] and Chicago Air Shower Array which closed in 2001.

[8] Extensive air showers of particles can be detected for gamma rays above 100 TeV.

This is unlike cosmic rays which have their direction of travel scrambled by magnetic fields.