论文标题
GRB 210217A：短或长GRB？
GRB 210217A: A short or a long GRB?
论文作者
论文摘要
传统上，伽马射线爆发是根据其$ t _ {\ rm 90} $ value（仪器观察$ 5 \％$ \％至$ 95 \％的gamma-ray/hard x-ray x-ray fluence）的时间间隔（\ rm 90} $ value）。但是，$ t _ {\ rm 90} $取决于检测器灵敏度和仪器运行的能量范围。结果，不同的仪器为爆发提供了不同的$ t _ {\ rm 90} $的值。 {\ it swift}和{\ it fermi}检测到GRB 210217a。它被{\ it swift} -bat归类为长/软grb，其$ t _ {\ rm 90} $值为3.76秒。另一方面，{\ it fermi} -gbm分类GRB 210217a的子阈值检测为短/硬爆发，持续时间为1.024秒。我们介绍了GRB 210217A的多波长分析（位于长GRB的重叠状态），以使用多波长数据来识别其实际类别。 We utilized the $T_{\rm 90}$-hardness ratio, $T_{\rm 90}$-\Ep, and $T_{\rm 90}$-$t_{\rm mvts}$ distributions of the GRBs to find the probability of GRB 210217A being a short GRB.此外，我们通过拟合接头XRT/UVOT SED并将爆发放置在Amati平面中来估计爆发的光度红移。我们发现GRB 210217a是一个模棱两可的爆发，显示了短和长类GRB的特性。
Gamma-ray bursts are traditionally classified as short and long bursts based on their $T_{\rm 90}$ value (the time interval during which an instrument observes $5\%$ to $95\%$ of gamma-ray/hard X-ray fluence). However, $T_{\rm 90}$ is dependent on the detector sensitivity and the energy range in which the instrument operates. As a result, different instruments provide different values of $T_{\rm 90}$ for a burst. GRB 210217A is detected with different duration by {\it Swift} and {\it Fermi}. It is classified as a long/soft GRB by {\it Swift}-BAT with a $T_{\rm 90}$ value of 3.76 sec. On the other hand, the sub-threshold detection by {\it Fermi}-GBM classified GRB 210217A as a short/hard burst with a duration of 1.024 sec. We present the multi-wavelength analysis of GRB 210217A (lying in the overlapping regime of long and short GRBs) to identify its actual class using multi-wavelength data. We utilized the $T_{\rm 90}$-hardness ratio, $T_{\rm 90}$-\Ep, and $T_{\rm 90}$-$t_{\rm mvts}$ distributions of the GRBs to find the probability of GRB 210217A being a short GRB. Further, we estimated the photometric redshift of the burst by fitting the joint XRT/UVOT SED and place the burst in the Amati plane. We found that GRB 210217A is an ambiguous burst showing properties of both short and long class of GRBs.
