论文标题
在Fermi GBM的11年观察中，搜索了镜头的伽马射线爆发
A search for lensed gamma-ray bursts in 11 years of observations by Fermi GBM
论文作者
论文摘要
伽马射线爆发（GRB）的大分子晶格有望表现为具有与前面相同的光曲线和光谱的GRB，但具有不同的通量和略有偏移位置。识别此类镜头可能会提供有关镜片，宇宙学以及GRB本身的重要信息。在这里，我们在$ \ sim 2700 $ grbs中搜索了镜头GRB，该GRB在11年的运营过程中观察到了Fermi Gamma-Ray Burst Monition（GBM）。为了识别镜头GRB，我们对位置，时间平均的光谱特性和相对持续时间进行初始切割。然后，我们使用互相关函数来评估光曲线的相似性，并最终分析最有前途的候选者的时间分辨光谱。我们没有发现令人信服的镜头候选人。最相似的对是单脉冲的GRB，具有相对较少的时间箱进行光谱分析。这是通过GRB人口中的相似性而不是镜头来解释的。但是，零结果并不排除样品中大烯烯的GRB的存在。特别是，我们发现观察不确定性和泊松波动会导致一对透镜GRB的显着差异。
Macrolensing of gamma-ray bursts (GRBs) is expected to manifest as a GRB recurring with the same light curve and spectrum as a previous one, but with a different flux and a slightly offset position. Identifying such lensed GRBs may give important information about the lenses, cosmology, as well as the GRBs themselves. Here we present a search for lensed GRBs among $\sim 2700$ GRBs observed by the Fermi Gamma-ray Burst Monitor (GBM) during 11 years of operations. To identify lensed GRBs, we perform initial cuts on position, time-averaged spectral properties and relative duration. We then use the cross-correlation function to assess the similarity of light curves, and finally analyze the time-resolved spectra of the most promising candidates. We find no convincing lens candidates. The most similar pairs are single-pulsed GRBs with relatively few time bins for the spectral analysis. This is best explained by similarities within the GRB population rather than lensing. However, the null result does not rule out the presence of macrolensed GRBs in the sample. In particular, we find that observational uncertainties and Poisson fluctuations can lead to significant differences within a pair of lensed GRBs.
