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We have collected near-infrared to X-ray data of 20 multi-epoch heavilyreddened SDSS quasars to investigate the physical mechanism of reddening. Ofthese, J2317+0005 is found to be a UV cutoff quasar. Its continuum, whichusually appears normal, decreases by a factor 3.5 at 3000{\AA}, compared to itsmore typical bright state during an interval of 23 days. During this suddencontinuum cut-off, the broad emission line fluxes do not change, perhaps due tothe large size of the Broad Line Region (BLR), r > 23 / (1+z) days. The UVcontinuum may have suffered a dramatic drop out. However, there are somedifficulties with this explanation. Another possibility is that the intrinsiccontinuum did not change, but was temporarily blocked out, at least towards ourline of sight. As indicated by X-ray observations, the continuum rapidlyrecovers after 42 days. A comparison of the bright state and dim states wouldimply an eclipse by a dusty cloud with a reddening curve having a remarkablysharp rise shortward of 3500{\AA}. Under the assumption of being eclipsed by aKeplerian dusty cloud, we characterized the cloud size with our observations,however, which is a little smaller than the 3000\AA\ continuum-emitting sizeinferred from accretion disk models. Therefore, we speculate this is due to arapid outflow or inflow with a dusty cloud passing through our line-of-sight tothe center.

The Optical Variability of SDSS Quasars from Multi-epoch Spectroscopy. III. A Sudden UV Cutoff in Quasar SDSS J2317+0005