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Roques (8), J. Rodriguez (10), J.-U. Ness (1), L. Natalucci (6), M. Cadolle Bel (1), M. Diaz Trigo (7), P. Lubinski (9), Poland (10) CEA, P. Ubertini (6), Saclay, Spain (2) NASA/MSFC, T. Belloni (4), the Netherlands), T. Munoz-Darias (4), Torun, Toulouse, USA (3) USRA, USA (4) INAF - Brera Observatory","submitted_at":"2011-02-10T12:52:47Z","abstract_excerpt":"Following the detection of a bright new X-ray source, MAXI J1659-152, a series of observations was triggered with almost all currently flying high-energy missions. We report here on XMM-Newton, INTEGRAL and RXTE observations during the early phase of the X-ray outburst of this transient black-hole candidate. We confirm the dipping nature in the X-ray light curves. We find that the dips recur on a period of 2.4139+/-0.0005 hrs, and interpret this as the orbital period of the system. It is thus the shortest period black-hole X-ray binary known to date. 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Bazzano (6), A. Ibarra (1), A.J. van der Horst (3), A.M.T. Pollock (1), A. Parmar (1), C. Kouveliotou (2), Copenhagen, C. Sanchez-Fernandez (1), C. Winkler (11) ((1) ESA/ESAC, Denmark (6) INAF/IASF Rome, E. Jourdain (8), E. Kuulkers (1), France (11) ESA/ESTEC, France (9) NCAC, Garching, G. De Cesare (6), Germany (8) IRAP, Italy (5) DTU Space, Italy (7) ESO, J. Chenevez (5), J.-P. Roques (8), J. Rodriguez (10), J.-U. Ness (1), L. Natalucci (6), M. Cadolle Bel (1), M. Diaz Trigo (7), P. Lubinski (9), Poland (10) CEA, P. Ubertini (6), Saclay, Spain (2) NASA/MSFC, T. Belloni (4), the Netherlands), T. Munoz-Darias (4), Torun, Toulouse, USA (3) USRA, USA (4) INAF - Brera Observatory","submitted_at":"2011-02-10T12:52:47Z","abstract_excerpt":"Following the detection of a bright new X-ray source, MAXI J1659-152, a series of observations was triggered with almost all currently flying high-energy missions. 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