Parkes observations for project P958 semester 2019APRS_83

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）至今引发的疑问远多于已解答的问题。直至数月前，学界仅确认一例已知会重复爆发的快速射电暴，其定位结果显示它位于遥远矮星系中的明亮射电星云（可能为年轻超新星遗迹或脉冲星风云）内。
过去一年间，依托澳大利亚平方千米阵列探路者（Australian Square Kilometre Array Pathfinder, ASKAP）开展的巡天搜索已探测到28次射电暴，其中两例的宿主星系红移量大于0.3。这批射电暴及其宿主天体与此前的重复暴特征迥异，暗示该类暴源群体或存在二分性。未来六个月内，我们预计将再探测到12例快速射电暴，且均可实现亚角秒级的精确定位。本研究计划针对该群体开展重复爆发搜寻：依托覆盖完整的样本集，以及对精确定位暴源的高密度监测计划——其能流探测下限相较此前的观测阈值低60倍以上——我们将得以验证是否存在更多重复爆发的快速射电暴，或是确认FRB 121102在该暴源群体中的独特性。