Parkes observations for project P958 semester 2019APRS_54

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）始终是未解之谜多于已知答案。直至数月前，仅有一个爆发——已知唯一的重复爆发——被定位到遥远矮星系中的明亮射电星云（可能是年轻超新星遗迹或脉冲星风云）。过去一年，澳大利亚平方千米阵探路者（ASKAP）的搜索已探测到28个爆发，其中两个已被定位到红移（redshift）>0.3的宿主星系。这些爆发及其宿主星系与重复爆发源截然不同，暗示该群体可能存在二分性。未来六个月，我们预计将探测到另外12个FRB，它们也将具有亚角秒定位精度。在此，我们提议对该群体进行重复爆发搜索。我们的全面样本及对精确定位爆发的密集监测计划（其通量极限比探测时低60倍以上），要么确认存在更多重复FRB，要么证实FRB121102在该群体中的独特性。