论文标题
从FRB 180916.J0158+65检测15次爆发
Detection of 15 bursts from FRB 180916.J0158+65 with the uGMRT
论文作者
论文摘要
我们报告了FRB 180916.J0158+65的UGMRT观察活动的发现，该活动最近发现显示其活跃周期的16.35天周期性。我们在预期活跃期的高峰期，在三个连续的周期中，在三个连续的周期中，以$ \ sim 2 $ \ sim观察到源为550-750 MHz。我们分别发现0、12和3爆发，即使在活动阶段内也意味着高度可变的爆发率。我们一致地检测到光谱能的微弱爆发仅比银河爆发源SGR 〜1935+2154高的数量级。检测到的爆发的到达时间排除了许多可能的别名解决方案，从而加强了16.35天的周期性的发现。短时间的周期性搜索没有返回高度重要的候选人。波束形式检测的两个脉冲足够明亮，可以在成像数据中清楚地检测到，从而实现了亚弧形定位，并证明了用GMRT进行FRB成像的概念证明。我们在650 MHz的持续无线电通量密度的上限为$3σ$，为$ 66〜μ {\ rm jy} $，与1.6〜GHz的EVN和VLA限制相结合，进一步限制了任何潜在的无线电对应物。这些结果证明了UGMRT对于靶向观测值检测和定位已知重复FRB的能力。
We report the findings of a uGMRT observing campaign on FRB 180916.J0158+65, discovered recently to show a 16.35-day periodicity of its active cycle. We observed the source at 550-750 MHz for $\sim 2$ hours each during three successive cycles at the peak of its expected active period. We find 0, 12, and 3 bursts respectively, implying a highly variable bursting rate even within the active phase. We consistently detect faint bursts with spectral energies only an order of magnitude higher than the Galactic burst source SGR~1935+2154. The times of arrival of the detected bursts rule out many possible aliased solutions, strengthening the findings of the 16.35-day periodicity. A short-timescale periodicity search returned no highly significant candidates. Two of the beamformer-detected bursts were bright enough to be clearly detected in the imaging data, achieving sub-arcsecond localization, and proving as a proof-of-concept for FRB imaging with the GMRT. We provide a $3σ$ upper limit of the persistent radio flux density at 650 MHz of $66~μ{\rm Jy}$ which, combined with the EVN and VLA limits at 1.6~GHz, further constrains any potential radio counterpart. These results demonstrate the power of uGMRT for targeted observations to detect and localize known repeating FRBs.
