This project is to continue timing and profile studies of the first double-pulsar system, a unique laboratory for gravitational physics. Important results published in our 53-page Phys. Rev. X paper (2021) include the first measurements of higher-order light-propagation effects and of the relativistic deformation of the orbit and highlight the importance of a long term observational campaign, including VLBI observations, for this remarkable system. The main aims of this proposal are to provide the strongest tests to date for general relativity and to measure for the first time the moment-of-inertia of a neutron star. Additionally, we will determine the system geometry, map the pulsar beams via geodetic precession, and search for the reappearance of Pulsar B. We exploit the high sensitivity and broad bandwidth of the UWL receiver. We are collaborating with the MeerKAT Double Pulsar Timing team to optimise combination of MeerKAT and UWL data.

With this proposal, we aim to continue P1032, the rapid measurements of relativistic parameters of southern binary pulsar systems using data from the Parkes Ultra Wideband Low (UWL) receiver. As the MeerTime project at the MeerKAT radio telescope ended in early 2024, observations with the UWL receiver now form the backbone for extending the timing baselines of many pulsars that have been part of this project. Since the source selection in the previous semesters was tailored such that the UWL receiver is the most (versatile and) suited instrument to achieve the proposed scientific goals for the chosen pulsars, we propose to continue these observations. We will use the UWL data to obtain significant orbital coverage and timing baselines on these pulsars and obtain important constraints on orbital and temporal DM variations that will help in identifying the nature of the companion stars. Increasing the number of measured Neutron Star (NS) masses, as well as improving on current constraints has profound implications for NS internal structure and for stellar and binary evolution physics.

With this proposal, we aim to continue P1032, the rapid measurements of relativistic parameters of southern binary pulsar systems using data from the Parkes Ultra Wideband Low (UWL) receiver. As the MeerTime project at the MeerKAT radio telescope ended in early 2024, observations with the UWL receiver now form the backbone for extending the timing baselines of many pulsars that have been part of this project. Since the source selection in the previous semesters was tailored such that the UWL receiver is the most (versatile and) suited instrument to achieve the proposed scientific goals for the chosen pulsars, we propose to continue these observations. We will use the UWL data to obtain significant orbital coverage and timing baselines on these pulsars and obtain important constraints on orbital and temporal DM variations that will help in identifying the nature of the companion stars. Increasing the number of measured Neutron Star (NS) masses, as well as improving on current constraints has profound implications for NS internal structure and for stellar and binary evolution physics.

With this proposal, we aim to continue P1032, the rapid measurements of relativistic parameters of southern binary pulsar systems using data from the Parkes Ultra Wideband Low (UWL) receiver. As the MeerTime project at the MeerKAT radio telescope ended in early 2024, observations with the UWL receiver now form the backbone for extending the timing baselines of many pulsars that have been part of this project. Since the source selection in APRS2024 was tailored such that the UWL receiver is the most (versatile and) suited instrument to achieve the proposed scientific goals for the chosen pulsars, we propose to continue these observations. We will use the UWL data to obtain significant orbital coverage and timing baselines on these pulsars and obtain important constraints on orbital and temporal DM variations that will help in identifying the nature of the companion stars. Increasing the number of measured Neutron Star (NS) masses, as well as improving on current constraints has profound implications for NS internal structure and for stellar and binary evolution physics. We request pre-graded status for this project for the next semester.

We discovered PSR J1716-2808A (NGC6316A), a highly accelerated binary millisecond pulsar (MSP), in the globular cluster NGC6316. We previously used Parkes to solve the orbit of this MSP and are currently timing it (P1330). We have five scheduled observations remaining in the OCT2024 semester. The goal of the proposed observations is to establish a year and a half long timing campaign with at least a year of monthly cadence observations. This is crucial to break the timing degeneracy that occurs between the pulsar's position and the pulsar's spindown rate. We will be able to use this to connect the pulsar to our previous observations spanning back to 2022, thereby creating a three year timing baseline. A secondary advantage of having these observations is that the data can also be used time any new pulsars that are discovered in any subsequent observations.

We propose a timing follow-up project for two newly discovered pulsars, J0915-6635 and J0917-6642, from the MWA-SMART survey. These pulsars were recently discovered from a blind periodic search of an 80-min SMART survey observation, with an localisation precision of 4 arcminutes. Initial flux density estimates suggest they are faint, requiring follow-up with the Parkes UWL receiver for precise timing solutions, flux density measurements, and polarimetric analysis. Initial analysis suggests a flux density 0.2-0.5 mJy for J0915-6635, and 0.1-0.3 mJy for J0917-6642 at 1.4 GHz, assuming a spectral index of -1.6. Observations with the Murriyang's UWL receiver will help enable a faster convergence to the full coherent timing solution and determine their spin and astrometric parameters, as well as further investigate this through measurements of pulsar flux densities and spectral indices. We will also perform a polarimetric analysis across a wide frequency range to better constrain the pulsars' geometries and emission properties.

We request time to observe 270 pulsars on a regular basis in order to achieve three main science goals. The first is to understand pulsars: how do they spin down and what disrupts this process, how and why their profiles vary with time, whether they precess or have planetary mass companions, in short all the things that make pulsar timing noisier than the perfect clock. Secondly we want to understand the interstellar medium of our Galaxy through repeated monitoring of dispersion measure, rotation measure and flux density variations in conjunction with scintillation parameters. Finally, we provide these data as a community service both to the high-energy community where we have strong collaborative links (particularly to Fermi) and to the radio pulsar astronomers generally through the CSIRO archive. The project is on-going since 2007, we are (co-)authors on 107 papers arising from the P574 data. The data have contributed to the PhD theses of students from Bordeaux, Manchester, Oxford, Stanford, and Swinburne. We are seeking long-term project status with a view to continuing the project into the SKA era.

We request time to observe 270 pulsars on a regular basis in order to achieve three main science goals. The first is to understand pulsars: how do they spin down and what disrupts this process, how and why their profiles vary with time, whether they precess or have planetary mass companions, in short all the things that make pulsar timing noisier than the perfect clock. Secondly we want to understand the interstellar medium of our Galaxy through repeated monitoring of dispersion measure, rotation measure and flux density variations in conjunction with scintillation parameters. Finally, we provide these data as a community service both to the high-energy community where we have strong collaborative links (particularly to Fermi) and to the radio pulsar astronomers generally through the CSIRO archive. The project is on-going since 2007, we are (co-)authors on 107 papers arising from the P574 data. The data have contributed to the PhD theses of students from Bordeaux, Manchester, Oxford, Stanford, and Swinburne. We are seeking long-term project status with a view to continuing the project into the SKA era.

Following the successful demonstration of a pilot first-pass (shallow) search of a small fraction of the sky, the second-pass processing has commenced for the SMART pulsar survey, which involves deep searches of 80-minute observations. The processing over the past year has led to the discovery of 11 new pulsars (including two millisecond ones), thus tripling the initial count from the first pass, and hinting at the exciting promise of this first southern-sky pulsar survey in the frequency band of SKA-Low. All new pulsars need to be timed in order to determine their spin and astrometric parameters and to select specialised targets for detailed follow-ups. With the MWA no longer supporting routine pulsar observations for the coming year, timing follow-ups rely on other telescopes. The Parkes \emph{Murriyang} telescope, with an identical sky coverage, sensitivity and the wide frequency coverage, offers the best option to time SMART discoveries. We have demonstrated \emph{Murriyang's} suitability for this through a pilot project last semester and are now extending the project to a larger sample of 10 pulsars including two from the pilot project. The data will also allow us to study pulse profiles, polarisation, and flux densities from $\sim$100 MHz to 4 GHz. The analysis/results will be included in a publication in preparation that will detail the deep-search pipeline and report on initial pulsar discoveries.

Following the successful demonstration of a pilot first-pass (shallow) search of a small fraction of the sky, the second-pass processing has commenced for the SMART pulsar survey, which involves deep searches of 80-minute observations. The processing over the past year has led to the discovery of 11 new pulsars (including two millisecond ones), thus tripling the initial count from the first pass, and hinting at the exciting promise of this first southern-sky pulsar survey in the frequency band of SKA-Low. All new pulsars need to be timed in order to determine their spin and astrometric parameters and to select specialised targets for detailed follow-ups. With the MWA no longer supporting routine pulsar observations for the coming year, timing follow-ups rely on other telescopes. The Parkes \emph{Murriyang} telescope, with an identical sky coverage, sensitivity and the wide frequency coverage, offers the best option to time SMART discoveries. We have demonstrated \emph{Murriyang's} suitability for this through a pilot project last semester and are now extending the project to a larger sample of 10 pulsars including two from the pilot project. The data will also allow us to study pulse profiles, polarisation, and flux densities from $\sim$100 MHz to 4 GHz. The analysis/results will be included in a publication in preparation that will detail the deep-search pipeline and report on initial pulsar discoveries.