Parkes observations for project P1345 semester 2025APRS_12

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（CRACO）系统发现的一批新型旋转射电暂现源（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已发现并精确定位了15颗新型RRATs，这类源的典型特征为存在零星脉冲，且其色散量（dispersion measures, DM）与银河起源射电源的色散特征相符。我们申请使用帕克斯（Parkes）望远镜共计22.5小时的观测时间，将每个目标的观测拆分为6个月内的三次30分钟观测。鉴于我们已获取角秒级精度的干涉定位结果，此次观测可帮助约束源的自转周期，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）评估其消隐比例与间歇性爆发特征；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RRAT源群体存在本质差异。即便仅探测到少量脉冲，部分科学目标也可得以实现。