  We report on a comprehensive all-sky search for periodic gravitational waves
in the frequency band 100-1500 Hz and with a frequency time derivative in the
range of $[-1.18, +1.00]\times 10^{-8}$ Hz/s. Such a signal could be produced
by a nearby spinning and slightly non-axisymmetric isolated neutron star in our
galaxy. This search uses the data from the Initial LIGO sixth science run and
covers a larger parameter space with respect to any past search.
  A Loosely Coherent detection pipeline was applied to follow up weak outliers
in both Gaussian (95% recovery rate) and non-Gaussian (75% recovery rate)
bands. No gravitational wave signals were observed, and upper limits were
placed on their strength. Our smallest upper limit on worst-case (linearly
polarized) strain amplitude $h_0$ is ${9.7}\times 10^{-25}$ near 169 Hz, while
at the high end of our frequency range we achieve a worst-case upper limit of
${5.5}\times 10^{-24}$. Both cases refer to all sky locations and entire range
of frequency derivative values.
