  We report on Chandra ACIS and XMM-Newton MOS/PN imaging observations of two
pulsar wind nebulae (K3/PSR J1420-6048 and G313.3+0.1=`the rabbit') associated
with the Galactic unidentified gamma-ray source GeV J1417-6100. With the
excellent ACIS imaging, the very energetic pulsar PSR J1420-6048 is separated
from its surrounding nebula. This nebula has surprisingly little compact
structure, although a faint arc is seen near the pulsar. Similarly, two point
sources are resolved in the rabbit nebula. The large XMM-Newton collecting area
provides useful spectral constraints on the rabbit and the associated point
sources. Based on spectra and X-ray morphology, we identify one point source as
a plausible pulsar counterpart. Large backgrounds and low source counts limited
pulse search sensitivities, but we report pulse upper limits and a candidate
108ms period for the rabbit pulsar based on the XMM-Newton data and an ACIS CC
observation. Comparison of the X-ray images with high resolution ATCA radio
maps shows that the non-thermal X-ray emission corresponds well with the radio
structure.
