... IRAF¹ 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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... service² https://ps1images.stsci.edu/cgi-bin/ps1cutouts

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... Pan-STARRS³ https://catalogs.mast.stsci.edu/panstarrs/

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... G band⁴ http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia19emq/

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... TNS⁵ https://www.wis-tns.org/object/2019osl

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... NED⁶ https://ned.ipac.caltech.edu

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