Constraining the nature of PMN J1603-4904-is it a gamma-loud young radio galaxyquestionMark

We request a 35ksec XMM observation of the gammaray emitting compact symmetricradio source PMNJ16034904 as a crucial part of the first simultaneous radio togammaray campaign on this object. Constraining the Xray spectrum of thecompact radio source is needed to properly model the broadband SED, which isessential for understanding the physical nature of this unusual object. TheSwift detection allows no spectral modeling of its very faint Xray counterpart,hence, precise spectral investigations with XMM are strongly required.PMNJ16034904 is one of the few young radio galaxy candidates associated with abright gammaray source, thus it plays a key role in investigating theunderlying emission mechanism of newly born active galaxies. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]