GRB Swift X-ray light curves analysis

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_X,iso_{prop.to}E^1.00+/-0.06^_{gamma},iso_/E^0.60+/-0.10^_pk_.