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We present a preliminary measurement of the time-dependent CP
asymmetry in B0 --> K*0 (K_S0 pi0) gamma decays based on 431 x 10^6
Upsilon(4S) --> BBbar decays collected with the BaBar detector at the PEP-II
asymmetric-energy e+e- collider at SLAC. In a sample containing
316 +/- 22 signal events we measure S_{K* gamma} = -0.08 +/- 0.31 +/- 0.05
and C_{K* gamma} = -0.15 +/- 0.17 +/- 0.03. The uncertainties are
statistical and systematic, respectively.
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