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Detection of signals from a possible extrasolar technological civilization isone of the challenging efforts of science. In this work, we propose usingnatural telescopes made of single or binary gravitational lensing systems tomagnify leakage of electromagnetic signals from a remote planet harbours anExtra Terrestrial Intelligent (ETI) technology. The gravitational microlensingsurveys are monitoring a large area of Galactic bulge for searchingmicrolensing events and they find more than $2000$ events per year. Theselenses are capable of playing the role of natural telescopes and in someoccasions they can magnify radio band signals from the planets orbiting aroundthe source stars in gravitational microlensing systems. Assuming that frequencyof electromagnetic waves used for telecommunication in ETIs is similar to ours,we propose follow-up observation of microlensing events with radio telescopessuch as Square Kilometre Array (SKA), Low Frequency Demonstrators (LFD) andMileura Wide-Field Array (MWA). Amplifying signals from the leakage ofbroadcasting by an Earth-like civilizations will allow us to detect them up tocenter of Milky Way galaxy. Our analysis shows that in binary microlensingsystems, the probability of amplification of signals from ETIs is more thanthat in single microlensing events. Finally we propose target of opportunitymode for follow-up observations of binary microlensing events with SKA as a newobservational program for searching ETIs. Using the optimistic values for thefactors of Drake equation provides detection of about one event per year.

Gravitational Microlensing Events as a Target for SETI project