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We search for the radiative penguin decays B_s to phi gamma and B_s to gammagamma in a 23.6 fb-1 data sample collected at the Upsilon(5S) resonance withthe Belle detector at the KEKB e+e- asymmetric-energy collider. We observe forthe first time a radiative penguin decay of the B_s meson in the B_s to phigamma mode. No significant B_s to gamma gamma signal is observed.

Observation of B_s to phi gamma and Search for B_s to gamma gamma Decays at Belle