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The Prompt-afterglow Connection in Gamma-ray Bursts: a Comprehensive Statistical Analysis of Swift X-ray Light-curvesWe 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 2-parameter relations. However and more importantly, we report on the existence of a universal 3-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(sub X,iso)∝ E(sup 1.00+/-0.06)(sub γ,iso) /E(sup 0.60+/-0.10)(sub pk).
Document ID
20140005252
Acquisition Source
Goddard Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Margutti, R. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Zaninoni, E. (Istituto di Astrofisica e Planetologia Spaziale (INAF-IAPS) Rome, Italy)
Bernardini, M. G. (Istituto di Astrofisica e Planetologia Spaziale (INAF-IAPS) Rome, Italy)
Chincarini, G. (Milan Univ. Italy)
Pasotti, F. (Istituto di Astrofisica e Planetologia Spaziale (INAF-IAPS) Rome, Italy)
Guidorzi, C. (Ferrara Univ. Italy)
Angelini, Lorella (NASA Goddard Space Flight Center Greenbelt, MD United States)
Burrows, D. N. (Pennsylvania State Univ. University Park, PA, United States)
Capalbi, M. (Italian Space Agency Matera, Italy)
Evans, P. A. (Leicester Univ. United Kingdom)
Gehrels, Neil (NASA Goddard Space Flight Center Greenbelt, MD United States)
Kennea, J. (Pennsylvania State Univ. University Park, PA, United States)
Mangano, V. (Istituto di Astrofisica Spaziale e Fisica Cosmica (INAF-IASF) Rome, Italy)
Moretti, A. (Istituto di Astrofisica Spaziale e Fisica Cosmica (INAF-IASF) Rome, Italy)
Nousek, J. (Pennsylvania State Univ. University Park, PA, United States)
Osborne, J. P. (Leicester Univ. United Kingdom)
Page, K. L. (Leicester Univ. United Kingdom)
Perri, M. (Italian Space Agency Matera, Italy)
Racusin, Judith Lea (NASA Goddard Space Flight Center Greenbelt, MD United States)
Romano, P. (Istituto di Astrofisica Spaziale e Fisica Cosmica (INAF-IASF) Palermo, Italy)
Sbarufatti, B. (Osservatorio Astronomico di Brera Merate, Italy)
Stafford, M. (Ohio State Univ. Columbus, OH, United States)
Stamatikos, Michael (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
May 8, 2014
Publication Date
January 10, 2012
Subject Category
Astronomy
Report/Patent Number
GSFC-E-DAA-TN8457
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
Gamma-Ray Bursts
prompt-afterglow connection
Comprehensive

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