Erratum: All-sky search for periodic gravitational waves in LIGO S4 data [Phys. Rev. D 77, 022001 (2008)]

An error has been found in the computation of the C parameter defined in Eq. (44), which led to its overestimation by a factor 2(1/4). The correct values for C are 9.2, 9.7, and 9.3 for the multi-interferometer, H1 and L1 analyses, respectively. None of the upper limits presented in the article were affected.