  There remain several definitive gamma-ray pulsars that are as yet undetected
in the optical regime. A classic case is the pulsar PSR B1951+32, associated
with the complex CTB 80 SNR. Previous ground based high speed 2-d optical
studies have ruled out candidates to m_V ~ 24. Hester (2000) has reported an
analysis of archival HST/WFPC2 observations of the CTB 80 complex which suggest
a compact synchrotron nebula coincident with the pulsar's radio position.
Performing a similar analysis, we have identified a possible optical
counterpart within this synchrotron nebula at m_V ~ 25.5, and another optical
counterpart candidate nearby at m_V ~ 24.2.
  PSR J0537-6910 is a young (canonical age ~ 5000 years), 16ms pulsar in the
LMC. We report a search for optical pulsations from the region around the X-ray
position. We see no obvious candidate exhibiting optical pulsations at the
X-ray period, with a 3 sigma upper limit of m_V ~ 23.6. We have also examined
recent Chandra results (Wang et al. 2001) and show that their X-ray-Optical
astrometry is in error by about 7''.
