Sennacherib was assassinated in 681 BCE.
The European Pulsar Timing Array -LRB- EPTA -RRB- is a European collaboration to combine five 100-m class radio-telescopes to observe an array of pulsars with the specific goal of detecting gravitational waves .. pulsars. pulsars. gravitational waves. gravitational waves. It is one of three pulsar timing array projects in operation , the others being the Parkes Pulsar Timing Array and the North American Nanohertz Observatory for Gravitational Waves .. Parkes Pulsar Timing Array. Parkes Pulsar Timing Array. North American Nanohertz Observatory for Gravitational Waves. North American Nanohertz Observatory for Gravitational Waves