Rapid Flares from TeV Blazars

We propose to observe a known TeV blazar in outburst. The observation will besupported by coordinated groundbased observations at TeV energies. The mainthrust of the proposed observation is to study flaring phenomenon on subhourtimescales jointly at Xray and TeV energies. XMM covers a critical spectralrange for studying TeV blazars, because the SED of such sources peaks in or nearits passing band. The data will also allow investigations of correlatedvariability of the Xray and TeV emission, spectral hysteresis, andhardnessintensity correlation. The results may shed significant light on theproperties of emitting regions in the jet of TeV blazars, emission mechanisms,and the composition of the jet (i.e., leptonic vs hadronic). truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]