Spectroscopic confirmation of the AGN nature of Swift J1933.9+3258 (=1RXS J193347.6+325422)

We report on optical spectroscopy of Swift J1933.9+3258 (=1RXS J193347.6+325422). This X-ray source has recently been classified as a likely radio-quiet AGN on the basis of its broad-band (radio, optical, UV, X-ray) properties (Grupe et al. 2006, ATel #859). In order to confirm its nature, a single 7-min spectrum of the optical counterpart was acquired on June 20 2006 08:53 UT with the 1.5m Tillinghast telescope on Mt.Hopkins using its FAST spectrograph.