GRB X-ray afterglows light curves analysis

Both quantities are measured relative to a rest-frame time of 200s after the {gamma}-ray trigger. The luminosity-average decay correlation does not depend on specific temporal behavior and contains one scale-independent quantity minimizing the role of selection effects.

This is a complementary correlation to that discovered by Oates et al. (2012MNRAS.426L..86O, 2015MNRAS.453.4121O) in the optical light curves observed by the Swift Ultraviolet Optical Telescope. The correlation indicates that, on average, more luminous X-ray afterglows decay faster than less luminous ones, indicating some relative mechanism for energy dissipation. The X-ray and optical correlations are entirely consistent once corrections are applied and contamination is removed.