Parkes observations for project P1183 semester 2023OCTS_04

We have detected a total of 48 bursts of FRB 20220529 using the Parkes UWL receiver, with 29 of them detected during full polarization observations. Our previous cooperating observations of FAST and Parkes for FRB 20220529 have revealed significant variations in flux distribution during different active periods. However, only 3 bursts from Parkes have been observed simultaneously with FAST, one of which has the potential to improve the spectrum limits of repeating FRBs by more than an order of magnitude. To further investigate FRB 20220529, we have scheduled regular FAST observations every fortnight, tracking the source for 20 minutes each time. Additionally, we have been granted another 10 hours of FAST time to facilitate simultaneous observations of FRB 20200529 using both the FAST and Parkes telescopes. Therefore, we propose to continue monitoring the source of FRB 20220529 using the Parkes UWL receiver, ensuring high-time resolution and employing full-polarization observations to: (1) detect more bursts using the Parkes UWL receiver, with corresponding simultaneous observations from FAST, in order to obtain robust constraints on the radiation spectrum of repeating FRBs; (2) explore additional clues regarding the active periods of FRB 20220529; (3) study the microstructure of the bursts.

我们利用帕克斯超宽频接收机（Parkes UWL receiver）共探测到快速射电暴（Fast Radio Burst, FRB）20220529的48个爆发事件，其中29个是在全偏振观测中被捕获的。此前我们针对FRB 20220529开展的500米口径球面射电望远镜（Five-hundred-meter Aperture Spherical radio Telescope, FAST）与帕克斯望远镜联合观测，已揭示出其在不同活跃时段的流量分布存在显著差异。但目前仅有3个来自帕克斯望远镜的爆发事件与FAST实现了同步观测，其中1个事件有望将重复FRB的频谱极限提升一个数量级以上。为进一步开展FRB 20220529的相关研究，我们已规划每两周开展一次FAST观测，每次对该源进行20分钟的跟踪观测。此外，我们还获批了额外10小时的FAST观测时长，用于开展FAST与帕克斯望远镜对FRB 20200529的同步观测。因此，我们提议继续利用帕克斯超宽频接收机对FRB 20220529源开展监测，保障高时间分辨率并采用全偏振观测方案，以实现以下目标：(1) 借助帕克斯超宽频接收机探测更多爆发事件，并同步开展FAST对应观测，从而对重复FRB的辐射频谱获得更为可靠的约束；(2) 探寻FRB 20220529活跃时段的更多相关线索；(3) 研究爆发事件的精细结构。