Mass Measurements of Isolated Objects from Space-based Microlensing

We report on the mass and distance measurements of two single-lens events from the 2015 Spitzer microlensing campaign. With both finite-source effect and microlens parallax measurements, we find that the lens of OGLE-2015-BLG-1268 is very likely a brown dwarf (BD). Assuming that the source star lies behind the same amount of dust as the Bulge red clump, we find the lens is a 45 +/- 7 M-J BD at 5.9 +/- 1.0 kpc. The lens of of the second event, OGLE-2015-BLG-0763, is a 0.50 +/- 0.04 M-circle dot star at 6.9 +/- 1.0 kpc. We show that the probability to definitively measure the mass of isolated microlenses is dramatically increased once simultaneous ground-and space-based observations are conducted.