标题： 高能 $γ$-射线从双星PSR B1259-63/LS 2883发射的变异性 显示英文标题

标题： Variability of VHE $γ$-ray emission from the binary PSR B1259-63/LS 2883

摘要： 我们研究了在双星系统PSR B1259-63/LS 2883的近日点过境期间三次观测活动中从其方向观测到的$\gamma$射线强度的变化。 一种简单直接的方法被应用于使用成像大气切伦科夫技术获得的已发表数据。 尽管检测过程中存在许多问题，该方法仅处理在指定区域注册的非常高能光子的数量。 在此框架内，我们在高显著性水平上识别出归因于源本征活动变化的变化。 显示英文摘要

摘要： We examine changes of the $\gamma$-ray intensity observed from the direction of the binary system PSR B1259-63/LS 2883 during campaigns around its three periastron passages. A simple and straightforward method is applied to the published data obtained with the Imaging Atmospheric Cherenkov Technique. Regardless of many issues of the detection process, the method works only with numbers of very high energetic photons registered in the specified regions. Within the realm of this scheme, we recognized changes attributable to the variations of the intrinsic source activity at high levels of significance.