  We present optical data which shows that G", the optical counterpart of the
gamma-ray pulsar Geminga, pulses in B with a period of 0.237 seconds. The
similarity between the optical pulse shape and the gamma-ray light curve
indicates that a large fraction of the optical emission is non-thermal in
origin - contrary to recent suggestions based upon the total optical flux. The
derived magnitude of the pulsed emission is m_B = 26.0 +/- 0.4. Whilst it is
not possible to give an accurate figure for the pulsed fraction (due to
variations in the sky background) we can give an upper limit of m_B ~ 27 for
the unpulsed fraction.
