  I consider a model of GRBs where they arise right before the merging of
binary pulsars. Binary pulsars moving through the companion's magnetic field
experience a large, motional electric field $\vec{E}=\vec{v}\wedge\vec{B}/c$,
which leads to the release in the pulsar magnetosphere of a pair cascade, and
the acceleration of a wind of pure pairs. The energy and energy deposition rate
of the wind are those of $\gamma$--ray bursts, provided the pulsars have a
field $\approx 10^{15}\;G$. Baryon contamination is small, and dominated by
tidal heating, leading to $M_{baryons}\approx 10^{-6}M_\odot$, as required by
the dirty fireball model of \Mesz, Laguna and Rees.
