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Determining physical parameters of binary microlenses is hampered by the lackof information about the angular Einstein radius due to the difficulty ofresolving caustic crossings. In this paper, we present the analysis of thebinary microlensing event OGLE-2013-BLG-0578, for which the caustic exit wasprecisely predicted in advance from real-time analysis, enabling to denselyresolve the caustic crossing and to measure the Einstein radius. From the massmeasurement of the lens system based on the Einstein radius combined with theadditional information about the lens parallax, we identify that the lens is abinary that is composed of a late-type M-dwarf primary and a substellarbrown-dwarf companion. The event demonstrates the capability of currentreal-time microlensing modeling and the usefulness of microlensing in detectingand characterizing faint or dark objects in the Galaxy.

OGLE-2013-BLG-0578L: Microlensing Binary Composed of A Brown Dwarf And An M Dwarf