标题： 档案中ZTF公共警报中的快速演化瞬变现象 显示英文标题

标题： Rapidly Evolving Transients in Archival ZTF Public Alerts

摘要： 我们在2018年5月至2021年12月期间，根据明确的标准，在Zwicky暂现巡天公共调查档案中寻找快速演化的暂现体（RET）候选体。搜索发现了19个确凿的RET候选体，对应于每年发现$\sim 5.2$个事件的比率。 即使使用了$20^\circ$的银河纬度切割，仍有8个事件（19个中的$\sim 42$%）位于银河系内，其中包括一个光变曲线形状与GW170817千倍新星（KN）非常相似的。 另外有一个事件是M31中的新星。 19个事件中有4个（$\sim 21$%）被确认为已知的河外RET（其中一个首次在此确认），另有6个事件的起源无法确定。 我们没有找到任何类似于GW170817 KN的河外事件，从而得到了GW170817类似KN事件的体积率的上限：小于$R \le$2400 Gpc$^{-3}$ yr$^{-1}$（95%置信度）。 这些结果可用于量化RET搜索中的污染源，特别是在独立于引力波和伽马射线暴触发的情况下搜索千倍新星时。 显示英文摘要

摘要： We search the archival Zwicky Transient Facility public survey for rapidly evolving transient (RET) candidates based on well-defined criteria between 2018 May and 2021 December. The search yielded 19 bona-fide RET candidates, corresponding to a discovery rate of $\sim 5.2$ events per year. Even with a Galactic latitude cut of $20^\circ$, 8 of the 19 events ($\sim 42$%) are Galactic, including one with a light-curve shape closely resembling that of the GW170817 kilonova (KN). An additional event is a nova in M31. Four out of the 19 events ($\sim 21$%) are confirmed extragalactic RETs (one confirmed here for the first time) and the origin of 6 additional events cannot be determined. We did not find any extragalactic events resembling the GW170817 KN, from which we obtain an upper limit on the volumetric rate of GW170817-like KNe of $R \le$ 2400 Gpc$^{-3}$ yr$^{-1}$ (95% confidence). These results can be used for quantifying contaminants to RET searches in transient alert streams, specifically when searching for kilonovae independently of gravitational-wave and gamma-ray-burst triggers.