GRB 201104A: A “repetitive” short gamma ray burst?. (arXiv:2205.02982v1 [astro-ph.HE])
<a href="http://arxiv.org/find/astro-ph/1/au:+Wang_Y/0/1/0/all/0/1">Yun Wang</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Jiang_L/0/1/0/all/0/1">Lu-Yao Jiang</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Ren_J/0/1/0/all/0/1">Jia Ren</a>
Gamma-ray bursts are divided into short gamma-ray bursts and long gamma-ray
bursts based on the bimodal distribution of their durations. Long bursts and
short bursts 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, gamma-ray bursts 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 quasi-periodic
oscillations and repetitive behaviors of gamma-ray bursts using timing analysis
methods and report a special event GRB 201104A, which is a long-duration burst
with characteristics of a short burst, and it exhibits a “repetitive” behavior.
We propose that such a situation may arise from lensed short gamma-ray bursts
and attempt to verify it by Bayesian analysis. In addition, we extend the
spectrum analysis to Bayesian inference. In spite of the existence of at least
two distinct time periods with similar spectral distributions, there is no
strong evidence that they result from a lensing gamma-ray burst. 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.
Gamma-ray bursts are divided into short gamma-ray bursts and long gamma-ray
bursts based on the bimodal distribution of their durations. Long bursts and
short bursts 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, gamma-ray bursts 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 quasi-periodic
oscillations and repetitive behaviors of gamma-ray bursts using timing analysis
methods and report a special event GRB 201104A, which is a long-duration burst
with characteristics of a short burst, and it exhibits a “repetitive” behavior.
We propose that such a situation may arise from lensed short gamma-ray bursts
and attempt to verify it by Bayesian analysis. In addition, we extend the
spectrum analysis to Bayesian inference. In spite of the existence of at least
two distinct time periods with similar spectral distributions, there is no
strong evidence that they result from a lensing gamma-ray burst. 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.
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