The 17 August 2017 binary-neutron-star merger detected through gravitational waves, with a short gamma-ray burst and a multiwavelength counterpart including a kilonova. Its joint observations connected compact-binary inspiral, relativistic outflows and heavy-element-rich ejecta.
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GW170817 is a significant astronomical event that was detected on August 17, 2017. It represents the first observed instance of a gravitational wave event caused by the merger of two neutron stars. This detection was made by the LIGO (Laser Interferometer Gravitational-Wave Observatory) and Virgo gravitational wave observatories.