Using Swift BAT hard X-rays, the authors show that NGC 4151's UV variability cannot come from a truncated disc within a few hundred gravitational radii, but is consistent with BLR-scale reprocessing at 1.5-20 light-days.
& Cohen R.D., 1983, ApJ, 271, 564
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Discarding the disc in a changing state AGN: the UV/X-ray relation in NGC 4151
Using Swift BAT hard X-rays, the authors show that NGC 4151's UV variability cannot come from a truncated disc within a few hundred gravitational radii, but is consistent with BLR-scale reprocessing at 1.5-20 light-days.