Parkes observations for project P958 semester 2019APRS_04

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其已解答的问题。直至数月前，仅有一种被证实可重复爆发的暴源被精确定位至遥远矮星系内的明亮射电星云（年轻超新星遗迹或脉冲星风云星云）。
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次暴发现象，其中2次已被定位至红移大于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差异显著，暗示该类暴源的群体或存在二分性。
我们预计在未来六个月内可再探测到12次快速射电暴，且这些暴源均可获得亚角秒级的精确定位。本研究拟针对该暴源群体开展重复爆发搜寻。我们的完整样本以及针对精确定位暴源的高密度监测计划，其能流探测极限较此前的探测结果低60倍以上，这将要么证实存在其他可重复爆发的快速射电暴，要么证明FRB 121102是该群体中独一无二的暴源。