Observations of the bright transient X-ray source GS 2023+338 conducted between May 30, 1989 and May 31, 1991 with the VLA at 1.49, 4.9, 8.4, and 14.9 GHz are reported. The radio spectrum evolved from an optically thin synchrotron radio source during the first 2 d to flat and then 'inverted', with a strong overall tendency to become more and more inverted during the remaining observations. The linear polarization detected during the first 50 d of observations confirms that the radiation is synchrotron emission. The mostly constant polarization angles indicate the stability of the magnetic field configuration for the emitting regions. Most observations showed significant variations on time scales of a few minutes to hours. The unique aspect of this event is the low decay component observed over a span of 2 yr, with coupled radio, optical, and X-ray emission and very localized surface brightness fluctuations.
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Han et al. (1992) studied this question.