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We report on an all-sky search with the LIGO detectors for periodicgravitational waves in the frequency range 50-1000 Hz and having a negativefrequency time derivative with magnitude between zero and $10^{-8}$ Hz/s. Datafrom the fourth LIGO science run have been used in this search. Three differentsemi-coherent methods of summing strain power were applied. Observing noevidence for periodic gravitational radiation, we report upper limits on strainamplitude and interpret these limits to constrain radiation from rotatingneutron stars.

Report on an all-sky LIGO search for periodic gravitational waves in the S4 data