Oral title: A hard X-ray view of the soft excess in AGN

Oral abstract: The soft excess detected in many Seyfert 1 galaxies below 1 keV has an uncertain nature. As it could be 
due to warm Comptonization or to blurred ionized reflection, we consider the different behaviors of these models above 
10 keV. We present the results of a study done on 102 Seyfert 1s from the Swift BAT 70-Month catalog, performing a joint 
spectral analysis of Swift/ BAT and XMM-Newton data in order to get a hard X-ray view of the soft excess and thus 
understand its nature. We will also discuss recent results obtained with the BAT AGN Spectroscopic Survey (BASS).