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>