Temporal variability of GRB early X-ray afterglows and GRB080319B prompt emission

摘要：

We performed the first systematic search for the minimum variability time scale between 0.3 and 10 keV studyingthe 28 brightest early(<3000 s)afterglows detected by Swift-XRT up to March 2008．We adopt the power spectrum analysisin the time domain：unlike the Fourier spectrnm,this iS suitable to study the rms variations at different time-scales．We findthat early XRT afterglows show variability in excess of the Poissonian noise level on time-scales as short as～1 s(rest framevalue),with the shortest tmin associated with the highest energy band The γ-ray prompt emission of GRB 080319B shows a characteristic average vafiability time-scale<tvar>～Is；thisparameter undergoes a remarkable evolution during the prompt emission(BAT observation)．

关键词： γ-ray sources γ-ray　burst

作者: R.Margutti C.Guidorzi G.Chincarini F.Pasotti S.Covino J.Mao

作者单位: INAE Osservatorio Astronomico di Brera,Via E.Bianchi 46,1-23807,Merate(LC),takt Universita degli Stu INAE Osservatorio Astronomico di Brera,Via E.Bianchi 46,1-23807,Merate(LC),takt INAE Osservatorio Astronomico di Brera,Via E.Bianchi 46,1-23807,Merate(LC),takt Universita degli St

会议类型: 国际会议

会议名称: 2008 NanJing Gamma-Ray Burst Conference(2008年伽马暴国际研讨会)

会议地点: 南京

会议语种:英文

页码: 259-262

在线出版日期: 2008-06-23（万方平台首次上网日期，不代表论文的发表时间）