Monitoring the temperature and reverberation delay of the circumnuclear hot dust in NGC 4151 K. Schnülle, J.-U. Pott, H.-W. Rix, B. M. Peterson, G. De Rosa and B. Shappee A&A, 578 (2015) A57 Published online: 04 June 2015 DOI: 10.1051/0004-6361/201525733