Cyg X-1

[References]

MAGIC: J. Albert et al., Astrophys. J. 665 (2007) L51 [variable]
           J. Ricol et al., 30th ICRC (2007) / arXiv:0709.2288 [astro-ph]
           M.L. Ahnen et al., arXiv:1708.03689 [astro-ph] <upper limit>

VERITAS: R. Guenette et al., ICRC2009 / arXiv:0908.0714 [astro-ph] <upper limit>