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The comprehensive statistical analysis of  Swift  X‐ray light curves, collecting data from six years of operation, revealed the existence of a universal scaling among the isotropic energy emitted in the rest‐frame 1 ‐ 10 4  keV energy band during the prompt emission (   E   γ  ,   iso), the peak of the prompt emission energy spectrum ( E  pk ) and the X‐ray energy emitted in the 0.3–10 keV observed energy band ( E  X, iso ). In this paper, we show that this three‐parameter correlation is robust and does not depend on our definition of  E  X, iso . It is shared by long, short and low‐energetic gamma‐ray bursts (GRBs), and thus reflects the existence of some properties which are shared by the GRB class as a whole. A more intuitive way to express the three‐parameter correlation is in the form of a two‐parameter correlation between the GRB efficiency and  E  pk . We speculate that the physical origin of such a relation is connected with the outflow Lorentz factor.

A universal scaling for short and long gamma‐ray bursts: E X,iso ‐ E γ,iso ‐ E pk