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For all exoplanet candidates, the reliability of a claimed detection needs tobe assessed through a careful study of systematic errors in the data tominimize the false positives rate. We present a method to investigate suchsystematics in microlensing datasets using the microlensing eventOGLE-2013-BLG-0446 as a case study. The event was observed from multiple sitesaround the world and its high magnification (A_{max} \sim 3000) allowed us toinvestigate the effects of terrestrial and annual parallax. Real-time modelingof the event while it was still ongoing suggested the presence of an extremelylow-mass companion (\sim 3M_\oplus ) to the lensing star, leading tosubstantial follow-up coverage of the light curve. We test and comparedifferent models for the light curve and conclude that the data do not favourthe planetary interpretation when systematic errors are taken into account.

Red noise versus planetary interpretations in the microlensing event OGLE-2013-BLG-446