  We test the spectral-energy correlation including the new bursts detected
(mostly) by Swift with firm measurements of their redshifts and peak energy.
The problem of identifying the jet breaks is discussed in the complex and
multibreak/flaring X-ray light curves observed by Swift. We use the optical
data as the most reliable source for the identification of the jet break, since
the X-ray flux may be produced by a mechanism different from the external
shocks between the fireball and the circumburst medium, which are responsible
for the optical afterglow. We show that the presence of an underlying SN event
in XRF 050416A requires a break to occur in the afterglow optical light curve
at around the expected jet break time. The possible presence of a jet break in
the optical light curve of GRB 050401 is also discussed. We point out that, for
measuring the jet break, it is mandatory that the optical light curve extends
after the epoch where the jet break is expected. The interpretation of the
early optical breaks in GRB 050922C and GRB 060206 as jet breaks is
controversial because they might instead correspond to the flat-to-steep decay
transition common in the early X-ray light curves. All the 16 bursts coming
from Swift are consistent with the E_p-E_gamma and E_p-E_iso-t_jet correlation.
No outlier is found to date. Moreover, the small dispersion of these
correlations, confirmed also by the Swift bursts, strengthens the case of using
GRBs as standard candles.

Astrophysics