Swift/XRT monitoring of five orbital cycles of LS I +61° 303 P. Esposito, P. A. Caraveo, A. Pellizzoni, A. De Luca, N. Gehrels and M. A. Marelli A&A, 474 2 (2007) 575-578 Published online: 10 September 2007 DOI: 10.1051/0004-6361:20078334