  We present an analysis indicating that there is a correlation between the
fluences and the durations of gamma-ray bursts, and provide arguments that this
reflects a correlation between the total emitted energies and the intrinsic
durations. For the short (long) bursts the total emitted energies are roughly
proportional to the first (second) power of the intrinsic duration. This
difference in the energy-duration relationship is statistically significant,
and may provide an interesting constraint on models aiming to explain the short
and long gamma-ray bursts.
