One of the important questions concerning this topic is to know sensitivity of instruments - the minimum detectable flux.
My rough estimate would be ~10^-18 photon/cm2-sec for a 1 day exposure time, for the current ground-based Cherenkov telescopes such as HESS.
Dear Dr Gerald, thank you very much for your answer. Can I see some publications with these technical details?
Your question in very timely! - In the next two weeks, there will be a conference on PeV astronomy (neutrinos, photons, etc.) in Annapolis, MD, USA. The link is: https://jsi.astro.umd.edu/conferences/2014-jsi-workshop.
This is a new, rapidly-changing observational field.
The program, with its talks and eventual papers presented & published should give you the latest data and results in this new field.
(My estimate above may be off by as much as several magnitudes.)
GJF
I'll have a look the website of the conference when they put proceedings and publications. Many thanks for your kind attention and such a useful information.
Greetings
ZO
Dear Dr Gerald Fishman,
one thing more: what about the sensitivity of PeV energy electron-positron pairs? Is its value more or less of the same order?
ZO
Upper limit for ultra-high energy gamma-ray intensity (>1PeV) is about 4x10-15 cm-2s-1sr-1 according to the measurements of CASA-MIA, EAS-TOP, KASCADE shower arrays. See references:
http://arxiv.org/pdf/1410.2599.pdf
http://arxiv.org/pdf/0905.3593v3.pdf
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