lensing star, thus the magnification of the event before, and after the caustic approach is rather low and the approach may be long before or after the closest approach to the lensing star. Follow-up groups typically do not densely monitor such events [@gould10]. Unlike planetary events with central-caustics perturbation, planetary-caustic events do not suffer from ambiguity in planet-star separation due to the discrete close-wide degeneracy. Thus, the planet sample discovered from planetary caustics may provide cleaner statistics in orbital separation distribution than those found in high-magnification events. The OGLE-IV survey discovers around 2000 microlensing events every year, and independent from the follow-up observations, it alone will potentially provide a powerful probe on the distribution of super-Jupiters orbiting low-mass stars beyond the snow line. The evidence for the existence of such planets is growing and puts a severe challenge for the core accretion theory of planetary formation.

We thank the anonymous referee for fruitful suggestions. The OGLE project has received funding from the European Research Council under the European Community’s Seventh Framework Programme (FP7/2007-2013)/ERC grant agreement No. 246678 to AU. SD was supported through a Ralph E. and Doris M. Hansmann Membership at the IAS and NSF grant AST-0807444. SK was 