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On 2017 August 17, the Laser Interferometer Gravitational-wave Observatory(LIGO) and the Virgo interferometer detected gravitational waves emanating froma binary neutron star merger, GW170817. Nearly simultaneously, the Fermi andINTEGRAL telescopes detected a gamma-ray transient, GRB 170817A. 10.9 hoursafter the gravitational wave trigger, we discovered a transient and fadingoptical source, Swope Supernova Survey 2017a (SSS17a), coincident withGW170817. SSS17a is located in NGC 4993, an S0 galaxy at a distance of 40megaparsecs. The precise location of GW170817 provides an opportunity to probethe nature of these cataclysmic events by combining electromagnetic andgravitational-wave observations.

Swope Supernova Survey 2017a (SSS17a), the Optical Counterpart to a Gravitational Wave Source