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We present the results from simultaneous radio (Very Large Array) and X-ray(Rossi-X-ray Timing Explorer) observations of the Z-type neutron star X-raybinary GX~17+2. The aim is to assess the coupling between X-ray and radioproperties throughout its three rapidly variable X-ray states and during thetime-resolved transitions. These observations allow us, for the first time, toinvestigate quantitatively the possible relations between the radio emissionand the presence of the hard X-ray tails and the X-ray state of the source. Theobservations show: 1) a coupling between the radio jet emission and the X-raystate of the source, i.e. the position in the X-ray hardness-intensity diagram(HID); 2) a coupling between the presence of a hard X-ray tail and the positionin the HID, qualitatively similar to that found for the radio emission; 3) anindication for a quantitative positive correlation between the radio fluxdensity and the X-ray flux in the hard-tail power law component; 4) evidencefor the formation of a radio jet associated with the Flaring Branch-to-NormalBranch X-ray state transition; 5) that the radio flux density of thenewly-formed jet stabilizes when also the normal-branch oscillation (NBO) inthe X-ray power spectrum stabilizes its characteristic frequency, suggesting apossible relation between X-ray variability associated to the NBO and the jetformation. We discuss our results in the context of jet models.

Linking Jet Emission, X-ray States and Hard X-ray Tails in the Neutron Star X-ray Binary GX 17+2