Pre-nova X-ray observations of V2491 Cygni (Nova Cyg 2008b) A. Ibarra, E. Kuulkers, J. P. Osborne, K. Page, J. U. Ness, R. D. Saxton, W. Baumgartner, V. Beckmann, M. F. Bode, M. Hernanz et al. (5 more) A&A, 497 1 (2009) L5-L8 Published online: 11 March 2009 DOI: 10.1051/0004-6361/200911710