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The particular giant X-ray bump of GRB 121027A triggered by \emph{Swift} isquite different from the typical X-ray flares in gamma-ray bursts. Thereexhibit four parts of the observed structural variabilities in the rise anddecay phase of the bump. Considering the quality of four parts of the data, wecan only analyze the data from about 5300 s to about 6100 s in the bump usingthe 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 bythe Lomb-Scargle method (Scargle 1982). Furthermore, a jet precession model(Liu et al. 2010) is proposed to account for such a variability.

Variability of the giant X-ray bump in GRB 121027A and possible origin