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tokens: We thank Brad Cenko, Maria Drout, Or Graur, Atish Kamble, Bob Kirschner, Dan Milisavljevic, Gautham Narayan, Matt Nicholl, Ashley Pagnotta, Ed Shaya, Isaac Shivvers, Jeff Silverman, Alicia Soderberg, and Łukasz Wyrzykowski for constructive suggestions and comments. The authors are especially grateful to Ryan Foley for providing user interface feedback; to Dmitry Tsvetkov and Pavlyuk Nikolay, who donated hundreds of historical light curves; to Pete Challis, Koji Kawabata, Hagai Perets, and Federica Bianco for providing a significant number of spectra; to Matt Nicholl and Lluís Galbany for donating their personal supernova light curve collections; to Carles Badenes, Dave Green, and Pierre Maggi for their SNR contributions; to Dan Milisavljevic for testing the duplicate finder (from data to appear in D. Milisavljevic et al. 2016, in preparation); to Federica Bianco, Matt Nicholl, Maria Pruzhinskaya, and Victor Lebedev (who also pointed us to many missing supernovae), and Ofer Yaron for finding several errors in the catalog; and to David Bishop for his close cooperation and tireless effort to maintain the Latest Supernovae webpage. 37 37 http://www.rochesterastronomy.org/supernova.html The authors would also like to thank the anonymous referee for their constructive comments. This work was supported in part by Einstein grant PF3-140108 (JG). The Open Supernova Catalog made use of NASA’s Astrophysics Data System; the VizieR catalog access tool, CDS, Strasbourg, France; Astropy, a community-developed core Python package for Astronomy (Astropy Collaboration et al. 2013 ); Astroquery (Ginsburg et al. 2016 ), Beautiful Soup 38 38 https://www.crummy.com/software/BeautifulSoup/bs4/doc/ ; DataTables 39 39 https://datatables.net/ ; the Wordpress blogging platform 40 40 http://wordpress.com/ ; the Bokeh interactive visualization library 41 41 http://bokeh.pydata.org/en/latest/ ; and DownloadThemAll, a Firefox add-on. 42 42 http://www.downthemall.net/