Cas A

[References]

HEGRA: F.A. Aharonian et al., AA 370, 112 (2001)

MAGIC: J. Albert et al., Astron. Astrophys. 474, 937 (2007)

VERITAS: T.B. Humensky et al., Gamma2008 / arXiv:0810.0799
         T.B. Humensky et al., ICRC2009 / arXiv:0907.5018 [astro-ph] 
         V.A. Acciari et al., ApJ 714, 163-169 (2010)
         A. Ghiotto et al., arXiv:1511.00309 [astro-ph]