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- ItemLuminosity dependent accretion state change in GRO J1008-57(Les Ulis : EDP Sciences, 2014) Kühnel, M.; Müller, S.; Kreykenbohm, I.; Fürst, F.; Pottschmidt, K.; Rothschild, R.E.; Caballero, I.; Grinberg, V.; Schönherr, G.; Shrader, C.; Klochkov, D.; Staubert, R.; Ferrigno, C.; Torrejón, J.-M.; Martínez-Núñez, S.; Wilms, J.In a former publication, we have analyzed the transient neutron star X-ray binary GRO J1008-57 using all available RXTE-, Swift-, and Suzaku-data. As we have found, the source's spectral components, i.e., a power-law with high exponential cutoff and a black-body, are strongly correlated with the hard X-ray flux (15-50 keV). We update the analytical description of these dependence, including a change in the photon index behaviour from a flat to a logarithmic function. The flux, where the change occurs, is consistent with the onset of the black-body emission. Thus, a change of the accretion state always occurs in GRO J1008-57 at a particular flux level.