Methods and results of an automatic analysis of a complete sample of Swift-XRT observations of GRBs

被引：1463

作者：

Evans, P. A. ^{[1
]}

Beardmore, A. P. ^{[1
]}

Page, K. L. ^{[1
]}

Osborne, J. P. ^{[1
]}

O'Brien, P. T. ^{[1
]}

Willingale, R. ^{[1
]}

Starling, R. L. C. ^{[1
]}

Burrows, D. N. ^{[2
]}

Godet, O. ^{[1
]}

Vetere, L. ^{[2
]}

Racusin, J. ^{[2
]}

Goad, M. R. ^{[1
]}

Wiersema, K. ^{[1
]}

Angelini, L. ^{[3
]}

Capalbi, M. ^{[4
]}

Chincarini, G. ^{[5
,6
]}

Gehrels, N. ^{[3
]}

Kennea, J. A. ^{[2
]}

Margutti, R. ^{[5
,6
]}

Morris, D. C. ^{[3
,7
]}

Mountford, C. J. ^{[1
]}

Pagani, C. ^{[1
]}

Perri, M. ^{[4
]}

Romano, P. ^{[8
]}

Tanvir, N. ^{[1
]}

机构：

[1] Univ Leicester, Dept Phys & Astron, Xray & Observat Astron Grp, Leicester LE1 7RH, Leics, England

[2] Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16802 USA

[3] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[4] ESRIN, ASDC, ASI Sci Data Ctr, I-00044 Frascati, Italy

[5] Osserv Astron Brera, INAF, I-23807 Merate, LC, Italy

[6] Univ Milano Bicocca, Dipartimento Fis, I-20126 Milan, Italy

[7] George Washington Univ, Dept Phys, Ctr Nucl Studies, Washington, DC 20052 USA

[8] Ist Astrofis Spaziale & Fis Cosm, INAF, I-90146 Palermo, Italy

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2009年 / 397卷 / 03期

关键词：

methods: data analysis; catalogues; gamma-rays: bursts; GAMMA-RAY BURSTS; AFTERGLOW LIGHT CURVES; DUST SCATTERING; JET BREAKS; EMISSION; PROMPT; FLARES; EVOLUTION; POSITIONS; DECLINE;

D O I：

10.1111/j.1365-2966.2009.14913.x

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a homogeneous X-ray analysis of all 318 gamma-ray bursts detected by the X-ray telescope (XRT) on the Swift satellite up to 2008 July 23; this represents the largest sample of X-ray GRB data published to date. In Sections 2-3, we detail the methods which the Swift-XRT team has developed to produce the enhanced positions, light curves, hardness ratios and spectra presented in this paper. Software using these methods continues to create such products for all new GRBs observed by the Swift-XRT. We also detail web-based tools allowing users to create these products for any object observed by the XRT, not just GRBs. In Sections 4-6, we present the results of our analysis of GRBs, including probability distribution functions of the temporal and spectral properties of the sample. We demonstrate evidence for a consistent underlying behaviour which can produce a range of light-curve morphologies, and attempt to interpret this behaviour in the framework of external forward shock emission. We find several difficulties, in particular that reconciliation of our data with the forward shock model requires energy injection to continue for days to weeks.

引用

页码：1177 / 1201

页数：25

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