  A few tight correlations linking several properties of gamma-ray bursts
(GRBs), namely the spectral peak energy, the total radiated energy, and the
afterglow break time, have been discovered with pre-Swift GRBs. They were used
to constrain the cosmological parameters, together with type-Ia supernovae.
However, the tightness of these correlations is a challenge to GRB models. We
explore the effect of adding Swift bursts to the Ghirlanda and Liang-Zhang
relations. Although they are both still valid, they become somewhat weakened
mostly due to the presence of significant outliers, which otherwise are
apparently normal GRBs so difficult to distinguish. The increased dispersion of
the relations makes them less reliable for purposes of precision cosmology.
