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 1-200 keV luminosity was measured to be 5 ~ { } 10 ^ { -9 } erg cm ^ { -2 } s ^ { -1 } which is less than \sim 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 7 keV and extending from 4 to 9 keV , and a soft excess with a color temperature below 1 keV which reveals itself only during one week of data .
High time-resolution analysis of 412 ksec 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 \arcsec -radius XMM error circle , but the limits are not very constraining because of heavy extinction ( A _ { V } = 16 ) .