  The structure of e+e- -> b bbar g events was studied using Z0 decays recorded
in the SLD experiment at SLAC. Three-jet final states were selected and the
CCD-based vertex detector was used to identify two of the jets as b or bbar.
Distributions of the gluon energy and polar angle were measured over the full
kinematic range for the first time, and compared with perturbative QCD
predictions. The energy distribution is potentially sensitive to an anomalous b
chromomagnetic moment kappa. We measured kappa to be consistent with zero and
set the first limits on its value, -0.17 < kappa < 0.11 at 95% c.l.
