  Searches were performed for topologies predicted by gauge-mediated
Supersymmetry breaking models (GMSB). All possible lifetimes of the
next-to-lightest SUSY particle (NLSP), either the lightest neutralino or
slepton, decaying into the lightest SUSY particle, the gravitino, were
considered. No evidence for GMSB signatures was found in the OPAL data sample
collected at centre-of-mass energies of sqrt{s}=189-209 GeV at LEP. Limits on
the product of the production cross-sections and branching fractions are
presented for all search topologies. To test the impact of the searches, a
complete scan over the parameters of the minimal model of GMSB was performed.
NLSP masses below 53.5 GeV/c^2 in the neutralino NLSP scenario, below 87.4
GeV/c^2 in the stau NLSP scenario and below 91.9 GeV/c^2 in the slepton co-NLSP
scenario are excluded at 95% confidence level for all NLSP lifetimes. The scan
determines constraints on the universal SUSY mass scale Lambda from the direct
SUSY particle searches of Lambda > 40,27,21,17,15 TeV/c^2 for messenger indices
N=1,2,3,4,5 for all NLSP lifetimes.
