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Title:
Methods and results of an automatic analysis of a complete sample of Swift-XRT observations of GRBs
Authors:
Evans, P. A.; Beardmore, A. P.; Page, K. L.; Osborne, J. P.; O'Brien, P. T.; Willingale, R.; Starling, R. L. C.; Burrows, D. N.; Godet, O.; Vetere, L.; Racusin, J.; Goad, M. R.; Wiersema, K.; Angelini, L.; Capalbi, M.; Chincarini, G.; Gehrels, N.; Kennea, J. A.; Margutti, R.; Morris, D. C.; Mountford, C. J.; Pagani, C.; Perri, M.; Romano, P.; Tanvir, N.
Affiliation:
AA(X-ray and Observational Astronomy Group, Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH), AB(X-ray and Observational Astronomy Group, Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH), AC(X-ray and Observational Astronomy Group, Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH), AD(X-ray and Observational Astronomy Group, Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH), AE(X-ray and Observational Astronomy Group, Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH), AF(X-ray and Observational Astronomy Group, Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH), AG(X-ray and Observational Astronomy Group, Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH), AH(Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Lab, University Park, PA 16802, USA), AI(X-ray and Observational Astronomy Group, Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH), AJ(Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Lab, University Park, PA 16802, USA), AK(Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Lab, University Park, PA 16802, USA), AL(X-ray and Observational Astronomy Group, Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH), AM(X-ray and Observational Astronomy Group, Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH), AN(NASA/Goddard Space Flight Center, Greenbelt, MD 20771, USA), AO(ASI Science Data Center, ASDC c/o ESRIN, via G. Galilei, 00044 Frascati, Italy), AP(INAF, Osservatorio Astronomico di Brera Via E. Bianchi 46, I-23807, Merate (LC), Italy; Università degli Studi di Milano-Bicocca, Dipartimento di Fisica, Piazza della Scienza 3, 20126, Milano, Italy), AQ(NASA/Goddard Space Flight Center, Greenbelt, MD 20771, USA), AR(Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Lab, University Park, PA 16802, USA), AS(INAF, Osservatorio Astronomico di Brera Via E. Bianchi 46, I-23807, Merate (LC), Italy; Università degli Studi di Milano-Bicocca, Dipartimento di Fisica, Piazza della Scienza 3, 20126, Milano, Italy), AT(NASA/Goddard Space Flight Center, Greenbelt, MD 20771, USA; Center for Nuclear Studies, Department of Physics, The George Washington University, Washington, DC 20052, USA), AU(X-ray and Observational Astronomy Group, Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH), AV(X-ray and Observational Astronomy Group, Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH), AW(ASI Science Data Center, ASDC c/o ESRIN, via G. Galilei, 00044 Frascati, Italy), AX(INAF, Istituto di Astrofisica Spaziale e Fisica Cosmica, Via U. La Malfa 153, I-90146 Palermo, Italy), AY(X-ray and Observational Astronomy Group, Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 397, Issue 3, pp. 1177-1201. (MNRAS Homepage)
Publication Date:
08/2009
Origin:
MNRAS
Astronomy Keywords:
methods: data analysis , catalogues , gamma-rays: bursts
DOI:
10.1111/j.1365-2966.2009.14913.x
Bibliographic Code:
2009MNRAS.397.1177E

Abstract

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.

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