Parkes observations for project P958 semester 2019APRS_16

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）引发的疑问远多于其已被解答的问题。直至数月前，仅有一种暴——目前已知唯一会重复爆发的快速射电暴——被定位至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）。
过去一年间，借助澳大利亚平方千米阵列探路者（Australian Square Kilometre Array Pathfinder, ASKAP）开展的巡天探测已发现28次暴，其中两例已被定位至红移大于0.3的宿主星系。这些暴及其宿主星系与该重复暴的特征差异显著，这表明快速射电暴群体或存在二分性。
未来六个月内，我们预计将再探测到12次快速射电暴，且这些暴均将具备亚角秒级的定位精度。在此背景下，本研究提议针对该群体开展重复爆发搜寻。我们的完整样本以及对定位精度优异的暴体开展的密集监测计划，其能流极限较此前探测阈值低60倍以上，这将要么证实存在更多重复型快速射电暴，要么确认FRB 121102是该群体中独一无二的存在。