Parkes observations for project P958 semester 2019APRS_18

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.
Over 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）带来的疑问远多于其已解答的问题。直至数月前，仅有一种暴——也是目前已知唯一会重复爆发的快速射电暴——被定位到遥远矮星系中的明亮射电星云（要么为年轻超新星遗迹，要么为脉冲星风云）内。过去一年间，依托澳大利亚平方公里阵列探路者（Australian Square Kilometre Array Pathfinder, ASKAP）开展的巡天观测已探测到28次快速射电暴，其中2次被精准定位至红移值大于0.3的宿主星系中。这些暴及其宿主星系与此前的重复暴特征截然不同，暗示快速射电暴族群或存在二分性差异。未来六个月内，我们预计将再探测到12次快速射电暴，且这些暴同样将获得亚角秒级的定位精度。为此，我们提议对该快速射电暴族群开展重复爆发搜寻工作。我们将依托覆盖全面的样本库，并针对定位精准的快速射电暴开展能流阈值较此前探测极限低60倍以上的高密度监测计划，要么证实存在更多重复爆发的快速射电暴，要么验证FRB 121102在整个快速射电暴族群中的唯一性。