Parkes observations for project P958 semester 2019APRS_81

Fast radio bursts (FRBs) continue to raise more questions than they answer. Until a few months ago, only one burst – the only one known to repeat - had been localized to a bright radio nebula (either a young supernova remnant or pulsar wind nebulae) in a distant dwarf galaxy. \r\nOver the last year searches with the Australian Square Kilometre Array Pathfinder (ASKAP) have detected 28 bursts, two of which have been localised to host galaxies at redshifts > 0.3. These bursts and their hosts are very unlike the repeater, suggesting there may be a dichotomy in the population. Over the next six months we expect to detect another 12 FRBs, which will also have sub-arcsecond localisations. Here we propose to search this population for repeats. Our comprehensive sample and a dense monitoring campaign of well localised bursts, at a fluence limit more than 60 times lower than that of their detections, will either confirm the presence of additional repeating FRBs or the uniqueness of FRB 121102 amongst the population.快速射电暴（Fast Radio Bursts, FRBs）所引发的疑问始终远超其已被阐释的谜题。直至数月之前，人类仅发现一例已知会重复爆发的射电暴，并将其定位至遥远矮星系中的明亮射电星云——该星云既可归类为年轻超新星遗迹，也可归为脉冲星风云星云。 过去一年间，依托澳大利亚平方千米阵探路者（Australian Square Kilometre Array Pathfinder, ASKAP）开展的巡天搜索已探测到28次快速射电暴，其中两例已被精准定位至红移值大于0.3的宿主星系。这些射电暴及其宿主天体与此前发现的重复暴特征迥异，这暗示快速射电暴的爆发种群或存在二分性差异。 我们预计在未来六个月内将再探测到12次快速射电暴，且这些暴同样将具备亚角秒级的定位精度。在此项研究中，我们提议针对该爆发种群开展重复爆发搜寻。我们所构建的完整样本，以及对定位精度优异的射电暴开展的密集监测计划——其通量极限相较于此前的探测阈值低逾60倍——将要么证实存在更多重复快速射电暴，要么证明FRB 121102是该种群中独一无二的个体。