Parkes observations for project P958 semester 2019OCTS_46

Fast radio bursts (FRBs) continue to raise more questions than they answer. Until last year, 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 two year searches with the Australian Square Kilometre Array Pathfinder (ASKAP) have detected 31 bursts, five of which have been localised to host galaxies at redshifts ranging from 0.1 to 0.5. These bursts and their hosts are very unlike the repeater, suggesting there may be a dichotomy in the population. However one of the arcminute-localised ASKAP FRBs has recently been found to repeat.\r\n Here we propose to search and study repetitions in this FRB population. 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 to characterise the fraction of bursts that repeat. For bursts that repeat the unique wide bandwidth observations will be used to test leading models of burst emission.

快速射电暴（Fast Radio Bursts，FRBs）引发的疑问远多于其所能解答的问题。直至去年，仅有一例被证实可重复爆发的射电暴被定位于遥远矮星系内的明亮射电星云——该星云要么为年轻超新星遗迹，要么为脉冲星风云。
过去两年间，依托澳大利亚平方千米阵列探路者（Australian Square Kilometre Array Pathfinder，ASKAP）的巡天观测已探测到31例快速射电暴，其中5例被定位于红移值介于0.1至0.5之间的宿主星系。这些射电暴及其宿主星系与此前的重复暴存在显著差异，这暗示快速射电暴群体或存在二分性。然而，近期研究发现，一例经ASKAP实现角分级定位的快速射电暴同样可重复爆发。
本研究拟针对该快速射电暴群体开展重复暴搜寻与相关研究。我们将依托覆盖全面的样本组，以及针对精确定位射电暴的高密度监测计划，设定比此前探测阈值低60余倍的能注量极限，以此量化可重复爆发的射电暴占比。针对可重复爆发的射电暴，我们将利用独具特色的宽频带观测数据，检验当前主流的射电暴辐射模型。