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The prompt-afterglow connection in gamma-ray bursts: a comprehensive statistical analysis of Swift X-ray light curves

Margutti, R ; Zaninoni, E ; Bernardini, M. G ; Chincarini, G ; Pasotti, F ; Guidorzi, C ; Angelini, L ; Burrows, D. N ; Capalbi, M ; Evans, P. A ; Gehrels, N ; Kennea, J ; Mangano, V ; Moretti, A ; Nousek, J ; Osborne, J. P ; Page, K. L ; Perri, M ; Racusin, J ; Romano, P ; Sbarufatti, B ; Stafford, S ; Stamatikos, M

Monthly notices of the Royal Astronomical Society, 2013-01, Vol.428 (1), p.729-742 [Periódico revisado por pares]

London: Oxford University Press

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  • Título:
    The prompt-afterglow connection in gamma-ray bursts: a comprehensive statistical analysis of Swift X-ray light curves
  • Autor: Margutti, R ; Zaninoni, E ; Bernardini, M. G ; Chincarini, G ; Pasotti, F ; Guidorzi, C ; Angelini, L ; Burrows, D. N ; Capalbi, M ; Evans, P. A ; Gehrels, N ; Kennea, J ; Mangano, V ; Moretti, A ; Nousek, J ; Osborne, J. P ; Page, K. L ; Perri, M ; Racusin, J ; Romano, P ; Sbarufatti, B ; Stafford, S ; Stamatikos, M
  • Assuntos: Gamma rays ; Sample size ; Stars & galaxies ; Statistical analysis ; X-ray astronomy
  • É parte de: Monthly notices of the Royal Astronomical Society, 2013-01, Vol.428 (1), p.729-742
  • Descrição: We present a comprehensive statistical analysis of Swift X-ray light curves of gamma-ray bursts (GRBs) collecting data from more than 650 GRBs discovered by Swift and other facilities. The unprecedented sample size allows us to constrain the rest-frame X-ray properties of GRBs from a statistical perspective, with particular reference to intrinsic time-scales and the energetics of the different light-curve phases in a common rest-frame 0.3-30 keV energy band. Temporal variability episodes are also studied and their properties constrained. Two fundamental questions drive this effort: (i) Does the X-ray emission retain any kind of 'memory' of the prompt γ-ray phase? (ii) Where is the dividing line between long and short GRB X-ray properties? We show that short GRBs decay faster, are less luminous and less energetic than long GRBs in the X-rays, but are interestingly characterized by similar intrinsic absorption. We furthermore reveal the existence of a number of statistically significant relations that link the X-ray to prompt γ-ray parameters in long GRBs; short GRBs are outliers of the majority of these two-parameter relations. However and more importantly, we report on the existence of a universal three-parameter scaling that links the X-ray and the γ-ray energy to the prompt spectral peak energy of both long and short GRBs: E X, iso∝E 1.00 ± 0.06 γ, iso/E 0.60 ± 0.10 pk.
  • Editor: London: Oxford University Press
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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