Parkes observations for project P1345 semester 2025APRS_06

This proposal aims to constrain burst rates and spin down properties of a sample of new Rotating Radio Transients (RRATs) discovered with the ASKAP CRAFT Coherent upgrade (CRACO) system. Over the past 12-months of commissioning, CRACO discovered and precisely localised 15 new RRATs, characterised by their sporadic pulses with dispersion measures (DM) consistent with Galactic sources. We request 22.5h of Parkes time split into three 30min observations spanning 6-months for each target. This can help constrain periods and potentially phase-coherent timing solutions given that we already have arcsec-precision interferometric localisations. Our main science goals are: 1) to measure their burst rates, periods, and spin-down properties; 2) to assess their nulling fraction and intermittency; 3) to measure their polarimetric properties and constrain their emission mechanism; 4) to determine if the CRACO RRATs are fundamentally different from the known RRAT population. Some of these goals can be answered even with the detection of a limited number of pulses.本提案旨在约束利用ASKAP CRAFT相干升级系统（CRACO）发现的一批新旋转射电暂现源（Rotating Radio Transients，RRATs）的爆发率与自转减慢特性。在过去12个月的调试阶段中，CRACO已发现并完成15个新RRATs的精确定位；这些源以间歇性射电脉冲为特征，其色散量（dispersion measures，DM）与银河内天体的理论值相符。我们申请获取帕克斯望远镜22.5小时的观测时间，将其拆分为每个目标在6个月周期内的三次30分钟观测。结合我们已获取的角秒级精度干涉定位结果，该观测方案可用于约束源的自转周期，并有望得到相位相干的计时解。我们的主要科学目标如下：1）测量这些源的爆发率、自转周期及自转减慢特性；2）评估其脉冲消隐比例与间歇性特征；3）测量其偏振特性并约束其辐射机制；4）确定CRACO发现的RRATs是否与已知的RRATs群体存在本质差异。即便仅探测到少量脉冲，部分科学目标也可得到解答。