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The results of the broadband spectral and timing study of the transient X-raypulsar GRO J2058+42 in a wide energy range at a low luminosity $L_{x} \simeq2.5\times 10^{36}$ erg s$^{-1}$ are reported. The data revealed that the pulseprofile and pulse fraction of the source are significantly changed incomparison with previous NuSTAR observations, when the source was ten timesbrighter. The cyclotron absorption line at $\sim10$ keV in the narrow phaseinterval is consistent with the high state observations. Spectral analysisshowed that at high luminosities $L_{x}\simeq (2.7-3.2)\times 10^{37}$ ergs$^{-1}$ the spectrum has a shape typical of accreting pulsars, while when theluminosity drops by about an order of magnitude, to $2.5\times 10^{36}$ ergs$^{-1}$ a two-component model is necessary to its describing. This behaviorfits into a model in which the low-energy part of the spectrum is formed in ahot spot, and the high-energy part is formed as a result of resonant Comptonscattering by incident matter in an accretion channel above the surface of aneutron star.

Changes in the nature of the spectral continuum and the stability of the cyclotron line in the X-ray pulsar GRO J2058+42