The correlations among variability,optical peak time and spectral time lag of long gamma-ray bursts  

作　　者：Bin Liao Yuan-Chuan Zou Fei-Fei Wang Yu Liu Wei-Hua Lei 廖斌;邹远川;王扉扉;刘屿;雷卫华(School of Physics,Huazhong University of Science and Technology,Wuhan 430074,China;School of Mathematics and Physics,Qingdao University of Science and Technology,Qingdao 266061,China)

机构地区：[1]School of Physics,Huazhong University of Science and Technology,Wuhan 430074,China [2]School of Mathematics and Physics,Qingdao University of Science and Technology,Qingdao 266061,China

出　　处：《Research in Astronomy and Astrophysics》2020年第11期205-212,共8页天文和天体物理学研究（英文版）

基　　金：This work is supported by the National Basic Research Program(‘973’Program)of China(Grant No.2014CB845800);the National Natural Science Foundation of China(Grant No.11773010).

摘　　要：Statistical relations are useful tools to comprehend the intrinsic physics processes of gamma-ray bursts(GRBs). In this work we collect spectral lag(τ), variability(V) and optical peak time(tp,o). We find that there is a correlation between variabilities and spectral lags, reading as V =-0.0075(±0.0007) ×log10τ +0.0351(±0.0024). There may also exist a relatively weak positive tendency between GRBs optical band peak times and their spectral time lags. Its Pearson coefficient is 0.398, which indicates a weak linear correlation. If we contain some "negative spectral lag" samples, then the latter relation would be worse due to two outlying points. The τ-V relation is consistent with previous studies, and the positive trend betweenτ and tp,oindicates the spectral lag of GRB might be caused by the curvature effect, but this conclusion is not significant.

关 键 词：gamma-ray burst general methods STATISTICAL 

分 类 号：P172.3[天文地球—天文学]