beyond the snow line of the host star, making it the fourth such object discovered via microlensing.

Observations
============

The observations were collected using the 1.3-m Warsaw Telescope situated in Las Campanas Observatory, Chile. The observatory is operated by the Carnegie Institute for Science. The telescope is equipped with a 32 CCD chip mosaic camera, which gives $1.4~{\rm deg}^2$ field of view. The pixel size is $15~\mu{\rm m}$, corresponding to $0.26{\ifmmode{''}\else$''$\fi}$ on the sky. The observations were conducted using the $I$-band filter. A few $V$-band observations of different fields are taken each night. They do not constrain the microlensing model and are used only to assess the color of the source star.

The microlensing event OGLE-2012-BLG-0406 was found at equatorial coordinates of 17:53:18.17 $-30$:28:16.2 ($l = -0.46^{\circ}$, $b = -2.22^{\circ}$) by the Early Warning System [@udalski03]. The event was found in the OGLE-IV field that is monitored with a typical cadence of $55$ minutes. The photometry for nights at ${\rm HJD'} = {\rm HJD} - 2450000$ of 6108 and 6109 showed a significant disagreement with a previously fitted standard @paczynski86 light-curve. Then the observations of the field were suspended because of proximity of the Moon. The microlensing community was alerted 