tokens: N.E.-R. thanks Avet Harutyunyan for his help and acknowledges the hospitality of the Institut de Ciències de l’Espai at the Autonomous University of Barcelona’s Campus, where much of this work was written. Support for this work was provided by NASA/ HST through grants GO-11575, GO-13684, GO-14668, and AR-14295 from the Space Telescope Science Institute (STScI), which is operated by AURA, Inc., under National Aeronautics and Space Administration (NASA) contract NAS5-26555. S.B. and M.T. acknowledge partial financial support by the PRIN-INAF 2017 (project “Towards the SKA and CTA Era: Discovery, Localization, and Physics of Transient Sources”). A.V.F. is grateful for generous financial assistance from the Christopher R. Redlich Fund, the TABASGO Foundation, the Miller Institute for Basic Research in Science (UC Berkeley), and US NSF grant AST-1211916. G.P. acknowledges support provided by the Millennium Institute of Astrophysics (MAS) through grant IC120009 of the Programa Iniciativa Cientíifica Milenio del Ministerio de Economía, Fomento y Turismo de Chile. L.G. was supported in part by NSF grant AST-1311862. N.S. was supported in part by NSF grants AST-1312221 and AST-1515559. This research is based in part on observations made with the NASA/ESA Hubble Space Telescope and obtained from the Hubble Legacy Archive, which is a collaboration between STScI/NASA, the Space Telescope European Coordinating Facility (ST-ECF/ESA), and the Canadian Astronomy Data Centre (CADC/NRC/CSA); the Spitzer Space Telescope , which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under a contract with NASA (support was provided by NASA through an award issued by JPL/Caltech); the SMARTS Consortium 1.3 m telescope located at Cerro Tololo Inter-American Observatory (CTIO), Chile; and the New Technology Telescope at the European Southern Observatory–La Silla Observatory. Data in this work have been taken in the framework of the European supernova collaboration involved in ESO-NTT large program 184.D-1140 led by Stefano Benetti. Many of the spectra used here for comparison were obtained from the Padova-Asiago Supernova Archive (ASA). This work has made use of the NASA/IPAC Extragalactic Database (NED), which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with NASA, and data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by NASA and the NSF. Facilities: Swift , Spitzer , ING:Kapteyn (JAG) , CTIO:1.3m (ANDICAM) , HST (WFPC2) , ACS , WFC3 , ESO:3.6m (EFOSC2 , SOFI) , Magellan:Clay (LDSS-3) , VLT:Yepun (HAWK-I) . Software: IRAF (Tody 1986 , 1993 ), SNOoPy ( http://sngroup.oapd.inaf.it/snoopy.html ), SExtractor (Bertin Arnouts 1996 ), HOTPANTS (Becker 2015 ), Dolphot (Dolphin 2000 ), GELATO ( https://gelato.tng.iac.es ), MOPEX ( http://irsa.ipac.caltech.edu/data/SPITZER/docs/dataanalysistools/tools/mopex/ ).
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