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

R. Margutti*, C. Guidorzi, G. Chincarini, F. Pasotti, S. Covino, J. Mao

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

10 Scopus citations


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

Original languageEnglish (US)
Title of host publication2008 Nanjing Gamma-Ray Burst Conference
Number of pages4
StatePublished - Dec 1 2008
Event2008 Nanjing Gamma-Ray Burst Conference - Nanjing, China
Duration: Jun 23 2008Jun 27 2008

Publication series

NameAIP Conference Proceedings
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616


Other2008 Nanjing Gamma-Ray Burst Conference


  • γ-ray burst
  • γ-ray sources

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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