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

• 来源期刊: 天文和天体物理学研究
• 年，卷（期）: 2020,（11）
• 页码范围: 37-44
• 页数: 8页
• 语种: 英文
• DOI: 10.1088/1674-4527/20/11/172

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(r),variability(V)and optical peak time(tp,0).We find that there is a correlation between variabilities and spectral lags,reading as V =-0.0075(±0.0007)x log10 r+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 r-V relation is consistent with previous studies,and the positive trend between r and tp,0 indicates the spectral lag of GRB might be caused by the curvature effect,but this conclusion is not significant.