  A model for GUT baryogenesis, coherent baryogenesis within the framework of
supersymmetric SO(10), is considered. In particular, we discuss the Barr-Raby
model, where at the end of hybrid infl ation charge asymmetries can be created
through the time-dependent higgsino-gaugino mixing mass matrix. These
asymmetries are processed to Standard Model matter through decays via
nonrenormalizable (B-L)-violating operators. We find that a baryon asymmetry in
accordance with observation can be generated. An appendix is devoted to provide
useful formulas and concrete examples for calculations within SO(10).
