The multifrequency campaign on 3C 279 in January 2006 W. Collmar, M. Böttcher, T. P. Krichbaum, I. Agudo, E. Bottacini, M. Bremer, V. Burwitz, A. Cuccchiara, D. Grupe and M. Gurwell A&A, 522 (2010) A66 Published online: 04 November 2010 DOI: 10.1051/0004-6361/201014823