Decoding disc-corona-jet variability in hard state black hole X-ray binaries

We request 4 additional TOO EPICpn observations of the hard states of BHXRBs,to expand our highly successful campaign of triggering based on significantchanges in characteristic timing signatures with respect to those seen inearlier hard state observations. Our campaign has already proven that anunstable disc drives the variability seen in hard states up to 1 Hz, and thatthe iron line becomes narrower as Lorentzian frequencies decrease. We willincrease our coverage of the factor 100 variation in Lorentzian frequenciesthroughout the hard state, to more smoothly map the evolution of disc andpowerlaw variability and the relationship to disc structure. We will usesimultaneous fast optical timing from the ground, to measure the direct connection between disc and jet. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]