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During the second observing run of the Laser Interferometer gravitational-wave Observatory (LIGO) and Virgo Interferometer, a gravitational-wave signalconsistent with a binary neutron star coalescence was detected on 2017 August17th (GW170817), quickly followed by a coincident short gamma-ray burst triggerby the Fermi satellite. The Distance Less Than 40 (DLT40) Mpc supernova searchperformed pointed follow-up observations of a sample of galaxies regularlymonitored by the survey which fell within the combined LIGO+Virgo localizationregion, and the larger Fermi gamma ray burst error box. Here we report thediscovery of a new optical transient (DLT17ck, also known as SSS17a; it hasalso been registered as AT 2017gfo) spatially and temporally coincident withGW170817. The photometric and spectroscopic evolution of DLT17ck are unique,with an absolute peak magnitude of Mr = -15.8 \pm 0.1 and an r-band declinerate of 1.1mag/d. This fast evolution is generically consistent with kilonovamodels, which have been predicted as the optical counterpart to binary neutronstar coalescences. Analysis of archival DLT40 data do not show any sign oftransient activity at the location of DLT17ck down to r~19 mag in the timeperiod between 8 months and 21 days prior to GW170817. This discoveryrepresents the beginning of a new era for multi-messenger astronomy opening anew path to study and understand binary neutron star coalescences, shortgamma-ray bursts and their optical counterparts.

The discovery of the electromagnetic counterpart of GW170817: kilonova AT 2017gfo/DLT17ck