Each proposal has a project ID, a summary description and status information.

This project is the principal GBT component of the NANOGrav observing program. We take monthly timing measurements of a set of 12 bright millisecond pulsars with the goal of constraining, and eventually detecting, the nHz gravitational wave background. Source selection is coordinated with our corresponding Arecibo program to make best use of the GBT's excellent sky coverage. This project was awarded 390 telescope hours through NRAO's Large Proposal program. Observations began in late 2007. PI: Paul Demorest.

This project aims to investigate systematic errors that affect high-precision pulsar timing measurements. By observing bright millisecond pulsars simultaneously with both telescopes, we hope to gain a better understanding of which effects are instrumental versus intrinsic to the pulsars. Understanding and correcting these errors is crucial in order for future large-area radio telescopes such as the SKA to reach their full pulsar timing potential. Observations are scheduled to begin in mid-2008. PI: Paul Demorest.

This proposal aims to measure proper motion and possibly geometric constraints on the binary orbits, while also providing microsecond-level residuals to the NANOGrav project. This project follows on from P1810, P2019 and P2203 and is scheduled on the Arecibo telescope starting in March 2008. PI: Ingrid Stairs.

We will extend our high precision millisecond pulsar timing program by observing nine millisecond pulsars at six-week intervals over the upcoming year. Dual-frequency observations will use the ASP and WAPP data acquisition systems, improving on the precision of previous pulsar timing work. Scientific payoffs will include improved neutron star mass measurements, more precise pulsar distance measurements, and more stringent limits on (or detections of ) the gravitational wave background. In addition to regularly spaced observations, we request two extra days to explore the possibility of exploiting the newly available 800 MHz WAPP bandwidth capability to observe millisecond pulsars with the S-high and C-band receivers.