Supernova 2006aj and the associated X-Ray Flash 060218 J. Sollerman, A. O. Jaunsen, J. P. U. Fynbo, J. Hjorth, P. Jakobsson, M. Stritzinger, C. Féron, P. Laursen, J.-E. Ovaldsen, J. Selj et al. (16 more) A&A, 454 2 (2006) 503-509 Published online: 11 July 2006 DOI: 10.1051/0004-6361:20065226