n-fold time coincidences on IGEC gravitational wave events data using data-base technology

摘要

Gravitational events on IGEC data are marked with their detection time t(d). Although t(d) takes into account phase shifts due to hardware and software, it could be statistically retarded or anticipated by noise with respect to the arrival time t(a) of a gravitational wave. Then we can estimate a time interval Delta for each event so that we can consider the t(a) of the event equally likely in Delta. Consequently we can define a n-fold coincidence as a n-tuple of events whose associated time intervals have a non-empty intersection. Using this definition and taking into account some time interval properties we show that a n-fold coincidence set can be computed by an appropriate selection of events from the 2-fold coincidence sets. Furthermore, we stress that a data base management system (DBMS) is a very effective tool to store IGEC data (i.e. events) and to implement n-fold coincidence analysis based on the above considerations. Finally we propose to use a DBMS to build a database of both events and n-fold coincidence analysis data in order to have an efficient and powerful tool for data retrieval and further analysis. [References: 2]