The first broadband study of a BH transient in quiescence with XMM and NuSTAR

Some of the most significant questions concerning the physics of black holetransients are addressed by studying BH binaries at low mass accretion rates.This is where radio observations indicate the presence of steady and powerfuljets, and quiescence is where significant accretion energy may be advectedacross the BH event horizon. The recently launched NuSTAR mission will providethe first opportunity to probe this luminosity regime at >10 keV by observingthe brightest quiescent system, V404 Cyg. We plan for coordinated radiocoverage, and including XMM in this campaign is essential for: 1. constrainingthe shape of the broadband spectrum and the origin of the Xray emission; 2.covering gaps in the light curve for the radio/Xray study; and 3. for comparison to previous Xray observations. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]