Of the light curves

We present multi–frequency simultaneous VLBI radio observations of the flat spectrum radio quasar 1633+382 (4C 38.41) as part of the interferometric monitoring of gamma-ray bright active galactic nuclei (iMOGABA) program combined with additional observations in radio, optical, X–rays and γ−rays carried out between the period 2012 March – 2015 August. The monitoring of this source reveals a significant long-lived increase in its activity since approximately two years in the radio bands, which correlates with a similar increase on all other bands from sub–millimeter to γ−rays. A significant correlation is also found between radio fluxes and simultaneous spectral indices during this period. The study of the discrete correlation function (DCF) indicates time lags smaller than the ∼ 40 days uncertainties among both radio bands and also high-energy bands, and a time lag of ∼70 days, with γ−rays leading radio. We interpret that the high-energy and radio fluxes are arising from different emitting regions, located at 1± 12 and 40± 13 pc from the central engine respectively. Subject headings: galaxies: active — galaxies: jets