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We present the results of the optical follow-up, conducted by the TOROScollaboration, of gravitational wave events detected during the AdvancedLIGO-Virgo second observing run (Nov 2016 -- Aug 2017). Given the limited fieldof view ($\sim100\arcmin$) of our observational instrumentation we targetedgalaxies within the area of high localization probability that were observablefrom our sites. We analyzed the observations using difference imaging, followedby a Random Forest algorithm to discriminate between real and bogus transients.For all three events that we respond to, except GW170817, we did not find anybona fide optical transient that was plausibly linked with the observedgravitational wave event. Our observations were conducted using telescopes atEstaci\'{o}n Astrof\'{\i}sica de Bosque Alegre, Cerro Tololo Inter-AmericanObservatory, and the Dr. Cristina V. Torres Memorial Astronomical Observatory.Our results are consistent with the LIGO-Virgo detections of a binary blackhole merger (GW170104) for which no electromagnetic counterparts were expected,as well as a binary neutron star merger (GW170817) for which an opticaltransient was found as expected.

TOROS Optical follow-up of the Advanced LIGO-VIRGO O2 second observational campaign