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We describe the GW follow-up strategy and subsequent results of the DLT40during the second science run (O2) of the LVC. Depending on the informationprovided in the GW alert together with the localization map sent by the LVC,DLT40 would respond promptly to image the corresponding galaxies selected byour ranking algorithm in order to search for possible EM counterparts in realtime. During the LVC O2 run, DLT40 followed ten GW triggers, observing between$\sim$20-100 galaxies within the GW localization area of each event. From thiscampaign, we identified two real transient sources within the GW localizationswith an appropriate on-source time -- one was an unrelated type Ia supernova(SN~2017cbv), and the other was the optical kilonova, AT2017fgo/SSS17a/DLT17ck, associated with the binary neutron star coalescenceGW170817 (a.k.a gamma-ray burst GRB170817A). We conclude with a discussion ofthe DLT40 survey's plans for the upcoming LVC O3 run, which include expandingour galaxy search fields out to $D\approx$65 Mpc to match the LVC's plannedthree-detector sensitivity for binary neutron star mergers.

Optical follow-up of gravitational wave events during the second advanced LIGO/VIRGO observing run with the DLT40 Survey