CONTINUING MONITORING OF NGC 4151

We propose to continue the monitoring of the Xray brightest Seyfert galaxy NGC4151 with integral, in order to measure its spectra as a function of the hardXray flux level. We will correlate the high energy spectral cutoff with othercontinuum parameters to determine the main physical mechanism driving thevariability. We will also disentangle the contributions to the reflection humpfrom close and distant reflectors, and correlate those with the narrow iron linevariability to determine the nature of the thick reprocessing medium and thegeometry of cold matter surrounding the source. We will finally probe for theexistence of a hard nonthermal tail. We request four observations of 200 kseach, for which we will propose four 10 ks accompanying XMMNewton observations. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]