2002A&A...390..597I

SAX J1711.6-3808 is an X-ray transient in the Galactic bulge that was active from January through May of 2001 and whose maximum 1-200keV luminosity was measured to be 5x10^–9erg/cm²/s which is less than ∼25% of the Eddington limit, if placed at a distance equal to that of the galactic center. We study the X-ray data that were taken of this moderately bright transient with instruments on BeppoSAX and RXTE. The spectrum shows two interesting features on top of a Comptonized continuum commonly observed in low-state X-ray binaries: a broad emission feature peaking at 7keV and extending from 4 to 9keV, and a soft excess with a color temperature below 1keV which reveals itself only during one week of data. High time-resolution analysis of 412ksec worth of data fails to show bursts, coherent or high-frequency quasi-periodic oscillations. Given the dynamic range of the flux measurements, this would be unusual if a neutron star were present. SAX J1711.6-3808 appears likely to contain a black hole. No quiescent optical counterpart could be identified in archival data within the 5"-radius XMM error circle, but the limits are not very constraining because of heavy extinction (A_V=16).