A common behavior in the late X-ray afterglow of energetic GRB-SN systems L. Izzo, G.B. Pisani, M. Muccino, J.A. Rueda, Y. Wang, C.L. Bianco, A.V. Penacchioni and R. Ruffini EAS Publications Series, 61 (2013) 595-597 Published online: 22 July 2013 DOI: 10.1051/eas/1361095