tokens: The authors thank Paul Kuin for the UVOTPY software used in extracting the UVOT spectra, Rollin Thomas for the SYN++ and SYNAPPS spectra synthesis packages, and Chris Burns for the SNooPy light-curve analysis program. We also thank the George P. and Cynthia Woods Mitchell Institute for Fundamental Physics Astronomy at Texas AM and the Carnegie Supernova Project. M.S. is supported partially by the NASA Swift Guest Investigator grant NNX15AR51G. P.J.B. and the Swift Optical/Ultraviolet Supernova Archive are supported by NASA’s Astrophysics Data Analysis Program through grant NNX13AF35G. We acknowledge the support of the staff of the Li-Jiang 2.4-m telescope (LJT), and Tsinghua-NAOC 80-cm telescope (TNT). Funding for the LJT has been provided by Chinese academy of science (CAS) and the People’s Government of Yunnan Province. The TNT is owned by Tsinghua University and operated by the National Astronomical Observatory of the Chinese Academy of Sciences (NAOC). J.J.Z. is supported by the National Natural Science Foundation of China (NSFC, grant 11403096). The work of X.F.W. is supported by the Major State Basic Research Development Program (2013CB834903), the NSFC (grants 11073013, 11178003, 11325313), Tsinghua University Initiative Scientific Research Program, and the Strategic Priority Research Program “The Emergence of Cosmological Structures” of the Chinese Academy of Sciences (grant No. XDB09000000). This research 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 the National Aeronautics and Space Administration.
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