Parkes observations for project P140 semester 2007APRS

It is the aim of this proposal to investigate the theoretical limits of pulsar timing. This term, we propose to continue monthly observations of the three best timing pulsars, to further increase our sensitivity to long-term variations. An intensive observing campaign on PSR J0437-4715 will help determine if millisecond pulsars can be integrated down to ~20ns errors with the Parkes telescope and help to measure instrumental offsets between backend systems. This high accuracy test will allow stringent limits on cosmological gravitational wave backgrounds into the future.