Parkes observations for project P1183 semester 2025APRS_08

After nearly two years of monitoring, comprising 126.7 hours over 57 observations with the Parkes telescope and 49.4 hours across 101 observations with the FAST telescopes, we have determined that FRB 20220529 is an extremely active repeater. It exhibits one of the longest activity durations and a potential period. Due to frequent observations scheduled with both Parkes and FAST, we recently observed an abrupt rotation measure (RM) flare in this source. This is the first detection of such an ``RM flare'' in a fast radio burst (FRB), suggesting that the source is in an environment with occasionally erupting coronal mass ejection. This presents a unique opportunity to study the eruption environment of FRBs and investigate the relation between burst activity and other burst parameters. If confirmed, the periodicity and the ``RM flare'' of FRB 20220529 would corroborate each other and become a ``smoking gun'' of the binary origin of FRB. In our previous analysis, both Parkes and FAST observations have proven essential. While FAST's higher sensitivity has enabled the capture of many bursts, Parkes' wideband receiver has provided a good burst detection rate even during low-rate phases. Notably, during the RM flare, two high signal-to-noise ratio bursts from Parkes have been crucial in understanding the RM variations. To further investigate FRB 20220529, we have scheduled regular FAST observations every fortnight, monitoring the source for 20 minutes each time. Therefore, we also propose to monitor FRB 20220529 using the Parkes UWL receiver, ensuring high-time resolution and employing full-polarization observations.

经过近两年的监测——包括利用帕克斯望远镜开展57次观测累计126.7小时，以及通过500米口径球面射电望远镜（FAST）进行101次观测累计49.4小时——我们确定FRB 20220529是一个极端活跃的重复暴源。它展现出最长的活动持续时间之一，且存在潜在的周期性。得益于帕克斯望远镜与FAST的高频次观测安排，我们近期在该源中观测到一次突发的旋转量（RM）耀发。这是首次在快速射电暴（FRB）中探测到此类"RM耀发"，表明该源所处环境中存在偶发的日冕物质抛射（coronal mass ejection）现象。这为研究FRB的爆发环境，以及探究爆发活动与其他爆发参数之间的关联提供了独特契机。若得到证实，FRB 20220529的周期性与"RM耀发"将相互印证，成为FRB双天体起源（binary origin）的"确凿证据（smoking gun）"。在我们此前的分析中，帕克斯望远镜与FAST的观测均被证实具有关键作用：FAST更高的灵敏度使其能够捕获大量爆发事件，而帕克斯望远镜的宽带接收机即便在低爆发率阶段也能保持良好的探测效率。值得注意的是，在此次RM耀发期间，帕克斯望远镜捕获的两个高信噪比（high signal-to-noise ratio）爆发事件对理解RM的变化至关重要。为进一步研究FRB 20220529，我们已安排每两周通过FAST进行一次常规观测，每次监测该源20分钟。因此，我们还建议利用帕克斯超宽带接收机（UWL）对FRB 20220529开展监测，以确保高时间分辨率并采用全极化观测模式。