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The International Pulsar Timing Array project combines observations ofpulsars from both Northern and Southern hemisphere observatories with the mainaim of detecting ultra-low frequency (~10^-9 to 10^-8 Hz) gravitational waves.Here we introduce the project, review the methods used to search forgravitational waves emitted from coalescing supermassive binary black-holesystems in the centres of merging galaxies and discuss the status of theproject.

The international pulsar timing array project: using pulsars as a gravitational wave detector