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The Extragalactic Serendipitous Swift Survey (ExSeSS) โ I. Survey definition and measurements of the X-ray number counts
We present the Extragalactic Serendipitous Swift Survey (ExSeSS), providing a new well-defined sample constructed from the observations performed using the Swift X-ray Telescope. The ExSeSS sample consists of 79,342 sources detected in the medium (1-2 keV), hard (2-10 keV) or total (0.3-10 keV) energy bands, covering 2086.6 deg$^{2}$ of sky โฆ