Title: Variability of the giant X-ray bump in GRB 121027A and possible origin Show Chinese title

Title: GRB 121027A中巨大X射线峰的变异性及可能的起源

Abstract: The particular giant X-ray bump of GRB 121027A triggered by \emph{Swift} is quite different from the typical X-ray flares in gamma-ray bursts. There exhibit four parts of the observed structural variabilities in the rise and decay phase of the bump. Considering the quality of four parts of the data, we can only analyze the data from about 5300 s to about 6100 s in the bump using the stepwise filter correlation method (Gao et al. 2012), and find that the $86^{+5.9}_{-9.4}~\rm s$ periodic oscillation may exist, which is confirmed by the Lomb-Scargle method (Scargle 1982). Furthermore, a jet precession model (Liu et al. 2010) is proposed to account for such a variability. Show Chinese abstract

Abstract: GRB 121027A由\emph{快速}触发的特殊巨大X射线峰与伽马射线暴中的典型X射线耀斑有很大不同。 在该峰的上升和衰减阶段，观测到结构变化的四个部分。 考虑到四部分数据的质量，我们只能使用逐步滤波相关方法（Gao等，2012）分析该峰中大约5300秒到6100秒的数据，并发现$86^{+5.9}_{-9.4}~\rm s$可能存在周期性振荡，这通过Lomb-Scargle方法（Scargle，1982）得到了验证。 此外，提出了一种喷流进动模型（Liu等，2010）来解释这种变化。