论文标题
GRB 201104a：“重复”短伽马射线爆发？
GRB 201104A: A "Repetitive" Short Gamma-Ray Burst?
论文作者
论文摘要
根据其持续时间的双峰分布，将伽马射线爆发（GRB）分为短伽马射线爆发（SGRB）和长伽马射线爆发（LGRB）。 LGRB和SGRB通常以不同的统计特征为特征。然而，有些样本挑战了这样一个框架，例如GRB 060614，这是一个长期爆发，具有短期特征。此外，GRB通常被认为是没有周期性或重复行为的事件，因为祖细胞通常会发生破坏性事件，例如大规模爆炸或二元紧凑型星星合并。在这项工作中，我们研究了FERMI数据，以使用定时分析方法对GRB的准准振荡和重复行为进行了重复，并报告了一种特殊的事件GRB 201104a，这是一个长期的爆发，具有SGRB的特征，并且表现出“重复性”行为。我们建议这种情况可能是由镜头的SGRB引起的，并试图通过贝叶斯推论对其进行验证。此外，我们将光谱分析扩展到贝叶斯推断。尽管存在至少两个不同的时间段，但尚无强烈的证据表明它们是由镜头GRB造成的。不考虑重力的重力镜头场景，长期爆发将类似于其重复行为的短暂爆发，这给当前的分类方案带来了挑战。
Gamma-ray bursts (GRBs) are divided into short gamma-ray bursts (SGRBs) and long gamma-ray bursts (LGRBs) based on the bimodal distribution of their durations. LGRBs and SGRBs are typically characterized by different statistical characteristics. Nevertheless, there are some samples that challenge such a framework, such as GRB 060614, a long-duration burst with short-burst characteristics. Furthermore, GRBs are generally considered to be an event with no periodic or repetitive behavior, since the progenitors usually undergo destructive events, such as massive explosions or binary compact star mergers. In this work, we investigated Fermi data for possible quasiperiodic oscillations and repetitive behaviors of GRBs using timing analysis methods and report a special event GRB 201104A, which is a long-duration burst with the characteristics of an SGRB, and it exhibits a "repetitive" behavior. We propose that such a situation may arise from lensed SGRBs and attempt to verify it by Bayesian inference. In addition, we extend the spectral analysis to Bayesian inference. In spite of the existence of at least two distinct time periods with a nearly identical spectrum, there is no strong evidence that they result from a lensing GRB. Taking the gravitational-lensing scenario out of consideration, a long burst would resemble a short burst in its repetitive behavior, which presents a challenge for the current classification scheme.
