tokens: This work is dedicated to our colleague and friend Tomas Dahlen, for whom this supernova has been named in memoriam. He is dearly missed. We thank the Hubble Frontier Fields team at STScI for their substantial efforts to make the HFF program successful. In particular, thanks are due to Matt Mountain for the allocation of discretionary orbits for the HFF program; to Jennifer Lotz, Norman Grogin, and Patricia Royle for accommodations in strategy and implementation to make the FrontierSN program possible; to Anton Koekemoer for HFF data processing support. We also thank the CLASH team, led by Marc Postman, for observations, catalogs, and high level science products that were of significant value for this analysis. Thanks to Jonatan Selsing for helpful comments on the manuscript. This work utilizes gravitational lensing models produced by modeling teams that were funded as part of the HST Frontier Fields program conducted by STScI. STScI is operated by the Association of Universities for Research in Astronomy, Inc. under NASA contract NAS 5-26555. The lens models were obtained from the Mikulski Archive for Space Telescopes (MAST). Financial support for this work was provided to S.A.R. by NASA through grants HST-HF-51312 and HST-GO-13386 from STScI, which is operated by Associated Universities for Research in Astronomy, Inc. (AURA), under NASA contract NAS 5-26555. A.M. acknowledge the financial support of the Brazilian funding agency FAPESP (Post-doc fellowship—process number 2014/11806-9). Support for this research at Rutgers University was provided in part by NSF CAREER award AST-0847157 to SWJ. The Dark Cosmology Centre is supported by the Danish National Research Foundation. J.M.D. acknowledges support of the consolider project CSD2010-00064 and AYA2012–39475-C02-01 funded by the Ministerio de Economia y Competitividad. J.M. contributed to this research from the Jet Propulsion Laboratory, California Institute of Technology, under a contract with NASA and acknowledges support from NASA Grants HST-GO-13343.05-A and HST-GO-13386.13-A. The research leading to these results has received funding from the People Programme (Marie Curie Actions) of the European Union’s Seventh Framework Programme (FP7/20072013) under REA grant agreement number 627288. A.Z. acknowledges financial support from NASA through grant HST-HF-51334.01-A awarded by STScI and operated by AURA. T.T. acknowledges support by the Packard Foundation in the form of Packard Research Fellowship. GLASS is funded by NASA through HST grant GO-13459. L.L.R.W. acknowledges the support of the Minnesota Supercomputing Institute. Facility: HST (WFC3).
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