Parkes observations for project P958 semester 2019APRS_73

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）所引发的疑问始终远多于其已解答的谜题。直至数月前，人类仅确认一例已知会重复的快速射电暴，其定位结果显示该暴位于遥远矮星系中的明亮射电星云（年轻超新星遗迹或脉冲星风云）内。 过去一年间，借助澳大利亚平方公里阵列探路者（Australian Square Kilometre Array Pathfinder, ASKAP）开展的巡天探测共发现28次快速射电暴，其中两例被定位至红移（redshift）量大于0.3的宿主星系（host galaxy）。这些暴及其宿主星系与此前的重复暴特征差异显著，暗示该FRB群体或存在二分性分化。 我们预计在未来六个月内可再探测到12次快速射电暴，且这些暴同样可获得亚角秒级（sub-arcsecond）的定位结果。在此我们提议对该FRB群体开展重复暴搜寻工作：依托完整的样本集，以及对定位精度优良的暴开展的高密度监测计划，且能流（fluence）探测阈值较此前的探测结果低60倍以上，本研究要么将证实存在更多重复快速射电暴，要么确认FRB 121102在该群体中具有独一无二的特性。