论文标题
长和短GRB的比较研究。 ii。一种多波长的方法来区分II型（大型恒星）和I型（紧凑型星）GRBS
A Comparative Study of Long and Short GRBs. II. A Multi-wavelength Method to distinguish Type II (massive star) and Type I (compact star) GRBs
论文作者
论文摘要
伽马射线爆发（GRB）在经验上被归类为长期grbs（lgrbs，$> $ 2s）和短期grbs（sgrbs，$ <$ 2s）。从物理上讲，它们可以分为两个不同的祖细胞类别：源自大型恒星（也称为II型）以及与紧凑型恒星（也称为I型）有关的祖细胞类别。即使大多数LGRB是II型，大多数SGRB是I型，但持续时间标准并不总是可靠的，可以确定某个GRB的物理类别。基于我们以前对长和短GRB的多波长特性的全面研究，在这里，我们利用天真的贝叶斯方法根据多波长标准将GRB物理分类为I型和II型GRB。它导致0.5 \％培训错误率和1 \％测试错误率。此外，在后赔率的分布中，还有一个差距[-1.2，-0.16]，$ \ log o（{\ rm ii：i}）$，II类型I类型I概率比率。因此，我们建议使用$ {\ cal o} = \ log o（{\ rm ii：i}）+0.7 $作为参数，将GRB分类为I（$ <0 $）或类型II（$> 0 $）。唯一确认的I型GRB，GRB 170817a，具有log $ o（{\ rm ii：i}）= - 10 $。根据此标准，无超新星长的GRB 060614和060505属于I型，两个有争议的短GRBS 090426和060121属于II型。
Gamma Ray Burst (GRBs) are empirically classified as long-duration GRBs (LGRBs, $>$ 2s) and short-duration GRBs (SGRBs, $<$ 2s). Physically they can be grouped into two distinct progenitor categories: those originating from collapse of massive stars (also known as Type II) and those related to mergers of compact stars (also known as Type I). Even though most LGRBs are Type II and most SGRBs are Type I, the duration criterion is not always reliable to determine the physical category of a certain GRB. Based on our previous comprehensive study of the multi-wavelength properties of long and short GRBs, here we utilize the Naive Bayes method to physically classify GRBs as Type I and Type II GRBs based on multi-wavelength criteria. It results in 0.5\% training error rate and 1\% test error rate. Moreover, there is a gap [-1.2, -0.16] in the distribution of the posterior Odds, $\log O({\rm II:I})$, the Type II to Type I probability ratio. Therefore, we propose to use ${\cal O} = \log O({\rm II:I})+0.7$ as the parameter to classify GRBs into Type I ($<0$) or Type II ($>0$). The only confirmed Type I GRB, GRB 170817A, has log $O({\rm II:I})=-10$. According to this criterion, the supernova-less long GRBs 060614 and 060505 belong to Type I, and two controversial short GRBs 090426 and 060121 belong to Type II.
