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Gamma-ray bursts (GRBs) are divided into short gamma-ray bursts (SGRBs) andlong gamma-ray bursts (LGRBs) based on the bimodal distribution of theirdurations. LGRBs and SGRBs are typically characterized by different statisticalcharacteristics. Nevertheless, there are some samples that challenge such aframework, such as GRB 060614, a long-duration burst with short-burstcharacteristics. Furthermore, GRBs are generally considered to be an event withno periodic or repetitive behavior, since the progenitors usually undergodestructive events, such as massive explosions or binary compact star mergers.In this work, we investigated Fermi data for possible quasiperiodicoscillations and repetitive behaviors of GRBs using timing analysis methods andreport a special event GRB 201104A, which is a long-duration burst with thecharacteristics of an SGRB, and it exhibits a "repetitive" behavior. We proposethat such a situation may arise from lensed SGRBs and attempt to verify it byBayesian inference. In addition, we extend the spectral analysis to Bayesianinference. In spite of the existence of at least two distinct time periods witha nearly identical spectrum, there is no strong evidence that they result froma lensing GRB. Taking the gravitational-lensing scenario out of consideration,a long burst would resemble a short burst in its repetitive behavior, whichpresents a challenge for the current classification scheme.

GRB 201104A: A "Repetitive" Short Gamma-Ray Burst?