0a6da88d-7677-5b90-9b49-ae7dd46441d7 urn:uuid en UTF-8 nonGeographicDataset nonGeographicDataset 2025-09-20T20:06:42 creation ISO 19115 2016 Long-term project observations for project P456 semester 2024OCTS_13 0a6da88d-7677-5b90-9b49-ae7dd46441d7 The Parkes Pulsar Timing Array (PPTA) project has three primary goals: (a) detection of gravitational waves from astronomical sources, (b) establishment of a pulsar timescale, and (c) improvement of our understanding of Solar-system dynamics. We are now in an exciting regime where a signal detected in our (and other data sets) has the form expected for a gravitational wave background. We are therefore now attempting to confirm, or deny, this exciting result. With this proposal we aim to maintain our pre-eminent position in the field. Unlike most observing proposals, this is a continuing proposal for which the observations will continue to improve bounds on ultra-low-frequency gravitational waves until they are finally detected. Continued Parkes observations will remain valuable at least until the first stage of the SKA is able to improve on our sensitivity and observing cadence. Even after the gravitational wave background is detected we will want to continue observations in support of the nascent field of gravitational wave astronomy!