2010A&A...516A..15W

IGR J01583+6713 is a new transient source discovered by the INTEGRAL/IBIS hard X-ray surveys. Optical observations have provided evidence that it is a high mass X-ray binary, but its nature remains unclear. We used the INTEGRAL/IBIS data to study IGR J01583+6713 during its outburst. We present the temporal profiles and spectral properties of IGR J01583+6713 around its outburst on 2005 Dec. 6. During the outburst, the mean X-ray luminosity reached around 4x10³⁵ erg/s in the energy range of 20-100keV. The continuum spectrum can be fitted by a bremsstrahlung model of kT∼35keV or a power-law model of Γ∼2.1. In addition, the electron resonant cyclotron absorption lines were detected at ∼35keV and possible at ∼67keV, implying that a magnetic neutron star of B∼4x10¹²G is located in IGR J01583+6713. We class IGR J01583+6713 as a transient X-ray sources with a magnetic neutron star. After the outburst, the flux of IGR J01583+6713 decreased and could not be detected by IBIS after 2005 Dec. 10. During the outburst, we cannot confirm the possible pulse period at 469s previously reported and did not detect the modulation signals in the range of 200-2000s with the IBIS observations. The transient hard X-ray source IGR J01583+6713 contains a magnetic neutron star, which would help to understand its transient nature.