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Ah so effectively none of the Hev photons reach the ground. I see the papers include the "Major Atmospheric Gamma Imaging Cherenkov (MAGIC) telescopes" data. I wouldn't have expected imaging to be practical because cherenkov is kind of scattering, but they seem to be able to triangulate individual collisions. Thanks for the correction.

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We basically see a blob of light from which we can deduce origin, energy and particle type of the particle that created the air shower.

If you have multiple telescopes observing the air showers this gets much better. MAGIC uses two 17m telescopes, VERITAS 4 12 m telescopes and HESS 4 12m and one 28 meter telescope.

CTA is currently in the planning and construction phase and will build around a hundred telescopes at two sites, Chile and La Palma.

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