Margutti, R.R.MarguttiZaninoni, E.E.ZaninoniBernardini, M. G.M. G.BernardiniPerri, MatteoMatteoPerri2020-09-172020-09-172013-11-01https://hdl.handle.net/20.500.13025/3434VizieR On-line Data Catalog J/MNRAS/428/729. Originally published in 2013MNRAS.428..729MWe 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 0.3-30keV 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 gamma-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 gamma-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 gamma-ray energy to the prompt spectral peak energy of both long and short GRBs E<SUB>X,iso</SUB>{prop.to}E<SUP>1.00+/-0.06</SUP><SUB>gamma,iso</SUB>/E<SUP>0.60+/-0.10</SUP><SUB>pk</SUB>. (3 data files).Gamma raysX-ray sources Comment fitkcorr.dat 437x566 Best-fitting parameters of the 0.3-10keV (observer; frame) light curves in de-absorbed flux units ; fluence.dat 437x466 0.3-10keV (observer frame) fluence table; energy.dat 165x457 0.3-10keV (rest frame) energy tablehttp://adsabs.harvard.edu/abs/2013yCat..74280729M2013yCat..74280729M