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OGLE-2014-BLG-0962 (OB140962) is a stellar binary microlensing event that waswell-covered by observations from the Spitzer satellite as well as ground-basedsurveys. Modelling yields a unique physical solution: a mid-M+M-dwarf binarywith $M_{\rm prim} = 0.20 \pm 0.01 M_\odot$ and $M_{\rm sec} = 0.16 \pm 0.01M_\odot$, with projected separation of $2.0 \pm 0.3$ AU. The lens is only$D_{\rm LS} = 0.41 \pm 0.06$ kpc in front of the source, making OB140962 abulge lens and the most distant Spitzer binary lens to date. In contrast,because the Einstein radius ($\theta_{\rm E} = 0.143 \pm 0.007$ mas) isunusually small, a standard Bayesian analysis, conducted in the absence ofparallax information, would predict a brown dwarf binary. We test the accuracyof Bayesian analysis over a set of Spitzer lenses, finding overall goodagreement throughout the sample. We also illustrate the methodology for probingthe Galactic distribution of planets by comparing the cumulative distancedistribution of the Spitzer 2-body lenses to that of the Spitzer single lenses.

OGLE-2014-BLG-0962 and the First Statistical Validation of Bayesian Priors for Galactic Microlensing