Parkes observations for project P1338 semester 2024OCTS_19

Fast radio bursts (FRBs) are millisecond-duration radio bursts of extragalactic origin. Since the discovery of the first FRB in the archival Parkes/Murriyang multibeam data, a broad dichotomy in population has emerged. Some FRBs have been seen to be repeating, while others are not, despite a significant amount of follow-up using different radio telescopes. The repeating FRB 20240114A was recently discovered by CHIME/FRB, which has been seen to have an exceptionally high burst activity. Such extreme burst activity has not been seen in any other source. The repeating FRBs, such as FRB 20240114A, provide an unparalleled window into their circumburst environment due to their repeating nature, which can be used to constrain possible progenitor models and test underlying emission mechanisms. The previous Parkes/Murriyang source follow-up has also revealed intriguing spectro-polarimetric properties, such as frequency-dependent evolution of burst central frequency or chromaticity, a possible activity window, significantly large circular polarisation (CP), and frequency-dependent CP. These properties hold the key towards understanding the circumburst environment of the FRBs, and test possible progenitor models. A large bandwidth instrument with reliable polarimetry has been critical in uncovering these properties. The ultra-wideband low (UWL) receiver on Parkes/Murriyang is ideally suited to explore the source's wideband spectro-temporal and polarimetric behaviour. We propose a campaign to regularly follow up FRB 20240114A to ascertain its long-term evolution of spectro-temporal properties.

快速射电暴（Fast Radio Bursts, FRBs）是河外起源的毫秒级持续时间射电暴。自首次在帕克斯/穆里扬（Parkes/Murriyang）多波束档案数据中发现首个FRB以来，其群体中出现了明显的二分法：尽管使用不同射电望远镜进行了大量后续观测，部分FRB被观测到具有重复性，而另一些则没有。重复快速射电暴20240114A最近由CHIME/FRB发现，其表现出异常高的爆发活跃度——这种极端的爆发活跃度在其他任何源中均未观测到。诸如FRB 20240114A之类的重复FRB，因其重复性，为了解其爆发周环境提供了独特窗口，可用于约束可能的前身星模型并检验潜在辐射机制。此前对帕克斯/穆里扬源的后续观测还揭示了引人注目的光谱偏振特性，例如爆发中心频率的频率相关演化、色散特性、显著的圆偏振（CP）以及频率相关的CP。这些特性是理解FRB爆发周环境和检验可能前身星模型的关键。具有可靠偏振测量能力的大带宽仪器对于揭示这些特性至关重要。帕克斯/穆里扬上的超宽带低（UWL）接收器非常适合探索该源的宽带光谱时间和偏振行为。我们提议开展一项定期后续观测FRB 20240114A的项目，以确定其光谱时间特性的长期演化。