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Wambsganss, J.-Y.Choi, Keith Horne, K. Ulaczyk, {\\L}. Wyrzykowski, M. D. Albrow, M. Dominik, M. Fausnaugh, M. Friedmann, M. Hundertmark, M. K. Szyma\\'nski, M. Pawlak, P. Mr\\'oz, P. Pietrukowicz, P. Verma, R. A. Street, R. Figuera Jaimes, R. Poleski, R. Schmidt, R. W. Pogge, S. Calchi Novati, S. Carey, S. Kaspi, S. Koz{\\l}owski, S.-L. Kim, S. Mao, S.-M. Cha, Subo Dong, T. Kerr, U.G. J{\\o}rgensen, V. Bozza, W. Varricatt, W. Zhu, Y. K. Jung, Y. Lee, Y. Shvartzvald, Y. Tsapras","submitted_at":"2015-08-26T20:08:06Z","abstract_excerpt":"We report the detection and mass measurement of a binary lens OGLE-2015-BLG-1285La,b, with the more massive component having $M_1>1.35\\,M_\\odot$ (80% probability). A main-sequence star in this mass range is ruled out by limits on blue light, meaning that a primary in this mass range must be a neutron star or black hole. The system has a projected separation $r_\\perp= 6.1\\pm 0.4\\,{\\rm AU}$ and lies in the Galactic bulge. 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