... Observatory¹ http://kanatatmp.g.hatena.ne.jp/kanataobslog/20111011/p1

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... Archive² http://people.physics.tamu.edu/pbrown/SwiftSN/ swiftsn.html

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... IRAF³ IRAF is distributed by the National Optical Astronomy Observatory, which is operated by AURA under cooperative agreement with the National Science Foundation

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... astronomers⁴ http://www.rochesterastronomy.org/sn2011/sn2011df.html

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... database⁵ http://ned.ipac.caltech.edu/

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