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We report the extremely high magnification (A > 1000) binary microlensingevent OGLE-2007-BLG-514. We obtained good coverage around the double peakstructure in the light curve via follow-up observations from differentobservatories. The binary lens model that includes the effects of parallax(known orbital motion of the Earth) and orbital motion of the lens yields abinary lens mass ratio of q = 0.321 +/- 0.007 and a projected separation of s =0.072 +/- 0.001$ in units of the Einstein radius. The parallax parameters allowus to determine the lens distance D_L = 3.11 +/- 0.39 kpc and total massM_L=1.40 +/- 0.18 M_sun; this leads to the primary and secondary componentshaving masses of M_1 = 1.06 +/- 0.13 M_sun and M_2 = 0.34 +/- 0.04 M_sun,respectively. The parallax model indicates that the binary lens system islikely constructed by the main sequence stars. On the other hand, we used aBayesian analysis to estimate probability distributions by the model thatincludes the effects of xallarap (possible orbital motion of the source arounda companion) and parallax (q = 0.270 +/- 0.005, s = 0.083 +/- 0.001). Theprimary component of the binary lens is relatively massive with M_1 =0.9_{-0.3}^{+4.6} M_sun and it is at a distance of D_L = 2.6_{-0.9}^{+3.8} kpc.Given the secure mass ratio measurement, the companion mass is therefore M_2 =0.2_{-0.1}^{+1.2} M_sun. The xallarap model implies that the primary lens islikely a stellar remnant, such as a white dwarf, a neutron star or a blackhole.

A possible binary system of a stellar remnant in the high magnification gravitational microlensing event OGLE-2007-BLG-514