PG 1553+113

[References]

H.E.S.S.: F. Aharonian et al. Astron. Astrophys. 448, L19-L23 (2006)
            F. Aharonian et al. Astron. Astrophys. 477, 481-489 (2008)
            W.Benbow et al., 30th ICRC (2007) / arXiv:0710.4057 [astro-ph] p.126

MAGIC: J. Albert et al., Astrophys. J. Lett. 654, L119-L122 (2007)
           J. Albert et al., arXiv:0812.3037 [astro-ph]