Testing Strong Gravity in Black Holes with XMM-Newton

We propose two 20ksec long Target of Opportunity observations on a bright (morethan 200mCrab) black hole transient in outburst, to study the relativistic FeKalpha line profile and its variability in such systems and to perform Xraytiming studies. Fe lines probe the innermost regions of accretion disks wherethe gravitational field is the most intense. To obtain a maximum signal to noiseratio in the line, these observations will be using the modified timing mode ofthe EPICpn cameras, recently employed successfully in observations of therelativistic line of Cygnus X1. The accurate measurement of the line shape willthen lead to constraints on the black hole spin. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]