Optical/infrared observations of the X-ray burster KS1731–260 in quiescence C. Zurita, E. Kuulkers, R. M. Bandyopadhyay, E. M. Cackett, P. J. Groot, J. A. Orosz, M. A. P. Torres and R. Wijnands A&A, 512 (2010) A26 Published online: 24 March 2010 DOI: 10.1051/0004-6361/200913061