Incoherent Strategies for the Network Detection of Periodic Gravitational Waves

In the Virgo Collaboration, a hierarchical procedure for the blind search of continuous gravitational signals has been developed. A brief description of the method with some bibliographic references and of the preliminary results obtained on the data of C6 and C7 Comissioning Runs can be found elsewhere in these Proceedings.1 In this paper we focus attention on an important part of the analysis, consisting in doing coincidences among the candidates found in two or more data sets, which allows to strongly reduce the false alarm probability. A characteristic of the continuous signals search is that data sets can indifferently belong to a single or more detectors