Pre-planned ToO of a pre-main sequence star undergoing an optical-IR outburst

Dramatic optical/IR outbursts from PMS stars, which signal the onset of rapidmassinfall onto such stars through their accretion disks, cannot be predicted.However, our Xray monitoring of the outbursts of V1647 Ori demonstrates that ahigh accretion rate can also produce an Xray outburst, and, indeed, that Xraymonitoring of PMS accretion outbursts represents a new observational window onthe magnetic interaction between the stellar magnetosphere and the accretiondisk. We propose a 40 ksexposure XMMNewton ToO of any optical/IR outburst fromPMS star to perform Xray spectroscopy with EPIC and to investigate Xrayvariability on a timescale of hours. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]