  We have searched for the rare hyperon radiative decay Omega- to Xi- gamma,
using the Fermilab Proton Center 375 GeV/c charged hyperon beam. Our
measurement of the Omega- beam fraction at 13.6 m from production is (4.8 +_
0.4)10**(-5). No signal was found and we determine a new upper limit of (4.6 x
10**-4) at 90% CL for the Omega- to Xi- gamma branching ratio.
