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Gravitational waves (GWs) are ripples in space-time that are known to existbut have not yet been detected directly. Once they are, a key feature of anyviable theory of gravity will be demonstrated and a new window on the Universeopened. GW astronomy was named as one of five key discovery areas in the NewWorlds, New Horizons Decadal Report. Pulsar timing probes GW frequencies, andhence source classes, that are inaccessible to any other detection method andcan uniquely constrain the nonlinear nature of General Relativity. Pulsartiming is therefore a critical capability with its own discovery space andpotential. Fulfilling this capability requires the complementary enablingfeatures of both the Green Bank Telescope (GBT) and the Arecibo Observatory.

Why Gravitational Wave Science Needs Pulsar Timing Arrays And Why Pulsar  Timing Arrays Need Both Arecibo and the GBT: A Response to the NSF-AST  Portfolio Review from the NANOGrav Collaboration