Spectro-timing analysis of Cygnus X-1 during a fast state transition M. Böck, V. Grinberg, K. Pottschmidt, M. Hanke, M. A. Nowak, S. B. Markoff, P. Uttley, J. Rodriguez, G. G. Pooley, S. Suchy et al. (2 more) A&A, 533 (2011) A8 Published online: 12 August 2011 DOI: 10.1051/0004-6361/201117159