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The EXTraS project (Exploring the X-ray Transient and variable Sky) willcharacterise the temporal behaviour of the largest ever sample of objects inthe soft X-ray range (0.1-12 keV) with a complex, systematic and consistentanalysis of all data collected by the European Photon Imaging Camera (EPIC)instrument onboard the ESA XMM-Newton X-ray observatory since its launch. Wewill search for, and characterize variability (both periodic and aperiodic) inhundreds of thousands of sources spanning more than nine orders of magnitude intime scale and six orders of magnitude in flux. We will also search for fasttransients, missed by standard image analysis. Our analysis will be completedby multiwavelength characterization of new discoveries and phenomenologicalclassification of variable sources. All results and products will be madeavailable to the community in a public archive, serving as a reference for abroad range of astrophysical investigations.

Science with the EXTraS Project: Exploring the X-ray Transient and variable Sky