  It is pointed out that the beaming correction commonly inferred from the
achromatic breaks in the afterglow light curve is biased in situations where
the isotropic equivalent energy is affected by factors other than the spread in
opening angles. In particular, it underestimates the beaming factor of sources
observed off-axis. Here we show that both the slopes and scatters in the Amati
and Ghirlanda relations, and the difference between them, are quantitatively
consistent with a model proposed recently, in which the $E_{iso}-\nu_{peak}$
relation, as originally derived by Amati et al., is due to viewing angle
effects. The quantitative difference between them confirms the relations
between opening angle and break time suggested by Frail et al.
