Discovery of spectral curvature in the shock downstream region: CIZA J2242.8+5301 A. Stroe, R. J. van Weeren, H. T. Intema, H. J. A. Röttgering, M. Brüggen and M. Hoeft A&A, 555 (2013) A110 Published online: 09 July 2013 DOI: 10.1051/0004-6361/201321267