Parkes observations for project P958 semester 2019APRS_70

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）带来的疑问远多于其所能解答的谜团。直至数月前，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——该星云要么为年轻超新星遗迹，要么属于脉冲星风云星云。 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）开展的射电暴巡天搜寻已探测到28次暴源，其中两例已被精确定位至红移大于0.3的宿主星系。这些暴源及其宿主星系与此前发现的重复暴源特征迥异，这暗示FRBs的爆发种群或存在二分性。 在未来六个月内，我们预计将再探测到12例FRBs，且均可实现亚角秒级定位。本研究拟针对该爆发种群开展重复爆发搜寻。我们将通过覆盖全面的样本观测，以及对精确定位暴源的高密度监测计划——其能流极限较此前探测阈值低60倍以上——要么验证额外重复FRBs的存在，要么证实FRB 121102在该爆发种群中的独特性。