A hyper luminous starburst at z=4.72 magnified by a lensing galaxy pair at z=1.48

L. Ciesla, M. Béthermin, E. Daddi +23

[Abridged] We discovered in the Herschel Reference Survey an extremely bright IR source with $S_{500}$~120mJy (Red Virgo 4 - RV4). Based on IRAM/EMIR and IRAM/NOEMA detections of t…