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IGR J01583+6713 is a new transient source discovered by the INTEGRAL/IBIShard X-ray surveys. Optical observations suggested that it should be a highmass X-ray binary, but its nature is still unclear. We used the INTEGRAL/IBISdata to study the nature of the transient hard X-ray source IGR J01583+6713during its outburst. Temporal profiles and spectral properties of IGRJ01583+6713 around its outburst on 2005 Dec 6 were obtained. During theoutburst, the mean X-ray luminosity reached around $4\times 10^{35}$ ergs$^{-1}$ in the energy range of 20 -- 100 keV. The continuum spectrum can befitted by a bremsstrahlung model of $kT\sim 35$ keV or a power-law model of$\Gamma\sim 2.1$, and the electron resonant cyclotron absorption lines at $\sim35$ keV and possible at $\sim 67$ keV were detected, suggesting that a magneticneutron star of $B\sim 4\times 10^{12}$ G is located in IGR J01583+6713. Thenwe identify IGR J01583+6713 as a transient X-ray sources with a magneticneutron star. After the outburst, the flux of IGR J01583+6713 was decreasingand it could not be detected by IBIS after 2005 Dec 10. During the outburst, wecannot conform the possible pulse period at 469 s reported before and have notdetected the modulation signals in the range of 200 -- 2000 s with the IBISobservations. The transient hard X-ray source IGR J01583+6713 contain amagnetic neutron star, which would help to understand its transient nature.

Discovery of a magnetic neutron star in X-ray transient IGR J01583+6713