Pulsed optical emission from Geminga
  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. 
A. Shearer, A. Golden, S. Harfst, R. Butler, R. M. Redfern, C. M.   O'Sullivan (National University of Ireland, Galway) G. M...