Spectral Variability of Seyfert Galaxies

GT We wish to perform long pointings (150 ksec) with XMM attwo bright Seyfert 1 galaxies, NGC4051 and Mrk766, in order to measure i) thepower spectrum of flux variations down to the shortest scales, ii) the crosscorrelation of variations at medium Xray, soft Xray, UV and opticalwavelengths, iii) changes in the spectral shape of the Xray continuum iv) variations of spectral features such as absorption from partially ionized gasand the fluorescent Fe emission line(s) in response to continuum variations. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]