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We report the discovery of absorption features in the X-ray spectrum of thetransient X-ray pulsar GROJ2058+42. The features are detected around $\sim10$,$\sim20$ and $\sim30$ keV in both NuSTAR observations carried out during thesource type II outburst in spring 2019. The most intriguing property is thatthe deficit of photons around these energies is registered only in the narrowphase interval covering around 10% of the pulsar spin period. We interpretthese absorption lines as a cyclotron resonant scattering line (fundamental)and two higher harmonics. The measured energy allow us to estimate the magneticfield strength of the neutron star as $\sim10^{12}$ G.

Discovery of a pulse-phase-transient cyclotron line in the X-ray pulsar GROJ2058+42