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

Authors :
Margutti, R.
Guidorzi, C.
Chincarini, G.
Pasotti, F.
Covino, S.
Mao, J.
Publication Year :
2008

Abstract

We performed the first systematic search for the minimum variability time scale between 0.3 and 10 keV studying the 28 brightest early (<3000 s) 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 about 1 s (rest frame value), with the shortest t_{min} associated with the highest energy band. The gamma-ray prompt emission of GRB080319B shows a characteristic average variability time-scale t_{var} of about 1s; this parameter undergoes a remarkable evolution during the prompt emission (BAT observation).<br />Comment: To be published in the "2008 Nanjing GRB Conference" conference proceedings

Subjects

Subjects :
Astrophysics

Details

Database :
arXiv
Publication Type :
Report
Accession number :
edsarx.0809.0189
Document Type :
Working Paper
Full Text :
https://doi.org/10.1063/1.3027924