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tokens: ACKNOWLEDGEMENTS We thank the referee for going through the manuscript carefully and providing constructive comments, which improved the manuscript. All the observers of the 2-m HCT (operated by the Indian Institute of Astrophysics), who kindly provided part of their observing time for observations of the supernova, are gratefully acknowledged. We thank Takashi Hattori, Ji Hoon Kim and the staff at the Subaru Telescope for their excellent support of observations under S15A-078 (PI: K. Maeda). We thank Professor David Branch for clarifying some of the issues related to the spectrum synthesis code syn++ . We also thank Dr Kuntal Mishra for providing us with the code for fitting the bolometric light-curve. This research has been supported in part by the DST-JSPS grant DST/INT/JSPS/P-211/2016, the Grant-in-Aid for Scientific Research of JSPS (15H02075, 16H02168, 26400222, 26800100) and MEXT (25103515, 15H00788), and by the World Premier International Research Center Initiative, MEXT, Japan. This work has made use of the public data in the Swift data archive and 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 (NASA).