VERITAS has effective area 100,000 m^2 Crab pulsar flux at energy E > 400 GeV is around 3 per minute thus, flux is 3 per minute per 10^5 m^2 F = (1/20) per second per 10^5 m^2 = 0.05 per second per 10^5 m^2 = 5 x 10^(-7) per second per m^2 Angular resolution of air-shower imaging telescopes VERITAS: 0.1 degree at 1 TeV References: General: https://arxiv.org/pdf/1407.1080.pdf https://veritas.sao.arizona.edu/veritas-science/introduction-to-vhe-gamma-ray-astrophysics-mainmenu-86 VERITAS: https://veritas.sao.arizona.edu/veritas-science/veritas-results-mainmenu-72/371-mrk421-14yrs https://veritas.sao.arizona.edu/documents/Proceedings/Williams_GRBs_Annapolis.pdf https://veritas.sao.arizona.edu/about-veritas-mainmenu-81/atmospheric-cherenkov-technique-and-veritas-technologies-mainmenu-87 https://veritas.sao.arizona.edu/about-veritas-mainmenu-81/veritas-specifications-mainmenu-111 MAGIC https://arxiv.org/pdf/1110.0947.pdf http://ihp-lx.ethz.ch/Stamet/magic/magicIntro.html https://arxiv.org/html/1111.0879 https://arxiv.org/pdf/1702.06795.pdf https://arxiv.org/pdf/1708.04043.pdf Fermi LAT: https://www-glast.stanford.edu/instrument.html Auger: https://www.auger.org/index.php/observatory/auger-hybrid-detector ---------- HAWC: https://arxiv.org/abs/1705.01551 https://arxiv.org/pdf/1701.01778.pdf (note the Figure 4: CR vs. gamma ray, also Fig 8, and Fig 12, Fig 15)