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

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

doi:10.1063/1.3027924

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

Physics and Astronomy

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

15 Scopus citations

Abstract

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 <t_var>∼1s; this parameter undergoes a remarkable evolution during the prompt emission (BAT observation).

Original language	English (US)
Title of host publication	2008 Nanjing Gamma-Ray Burst Conference
Pages	259-262
Number of pages	4
DOIs	https://doi.org/10.1063/1.3027924
State	Published - 2008
Event	2008 Nanjing Gamma-Ray Burst Conference - Nanjing, China Duration: Jun 23 2008 → Jun 27 2008

Publication series

Name	AIP Conference Proceedings
Volume	1065
ISSN (Print)	0094-243X
ISSN (Electronic)	1551-7616

Other

Other	2008 Nanjing Gamma-Ray Burst Conference
Country/Territory	China
City	Nanjing
Period	6/23/08 → 6/27/08

Keywords

γ-ray burst
γ-ray sources

ASJC Scopus subject areas

General Physics and Astronomy

Access to Document

10.1063/1.3027924

Cite this

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title = "Temporal variability of GRB early X-ray afterglows and GRB080319B prompt emission",

abstract = "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 var>∼1s; this parameter undergoes a remarkable evolution during the prompt emission (BAT observation).",

keywords = "γ-ray burst, γ-ray sources",

author = "R. Margutti and C. Guidorzi and G. Chincarini and F. Pasotti and S. Covino and J. Mao",

year = "2008",

doi = "10.1063/1.3027924",

language = "English (US)",

isbn = "9780735405967",

series = "AIP Conference Proceedings",

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note = "2008 Nanjing Gamma-Ray Burst Conference ; Conference date: 23-06-2008 Through 27-06-2008",

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TY - GEN

T1 - Temporal variability of GRB early X-ray afterglows and GRB080319B prompt emission

AU - Margutti, R.

AU - Guidorzi, C.

AU - Chincarini, G.

AU - Pasotti, F.

AU - Covino, S.

AU - Mao, J.

PY - 2008

Y1 - 2008

N2 - 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 var>∼1s; this parameter undergoes a remarkable evolution during the prompt emission (BAT observation).

AB - 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 var>∼1s; this parameter undergoes a remarkable evolution during the prompt emission (BAT observation).

KW - γ-ray burst

KW - γ-ray sources

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U2 - 10.1063/1.3027924

DO - 10.1063/1.3027924

M3 - Conference contribution

AN - SCOPUS:77956097019

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T3 - AIP Conference Proceedings

SP - 259

EP - 262

BT - 2008 Nanjing Gamma-Ray Burst Conference

T2 - 2008 Nanjing Gamma-Ray Burst Conference

Y2 - 23 June 2008 through 27 June 2008

ER -

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

Abstract

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Keywords

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