  In $\rm Sr_2RuO_4$ the spin excitation spectrum is dominated by
incommensurate fluctuations at q=(0.3 0.3 q$_z$), which arise from
Fermi-surface nesting. We show that upon Ti substitution, known to suppress
superconductivity, a short range magnetic order develops with a propagation
vector (0.307 0.307 1). This finding confirms that superconducting $\rm
Sr_2RuO_4$ is extremely close to an incommensurate spin density wave
instability. In addition, the ordered moment in \srton ~ points along the
c-direction, which indicates that the incommensurate spin fluctuations exhibit
the anisotropy required to explain a p-wave spin triplet pairing.
