More than an artifact?

https://www.legacysurvey.org//viewer/?ra=164.4908&dec=17.5366&layer=ls-dr9&zoom=15

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Looks to be a #supernova
It’s visible in 2018-03-15, 2018-03-16, and 2018-03-17 exposures but not in 2018-02-19 so the explosion happened quite early in the images.

Not found on BSP, TNS or JPL so it looks to be unreported as well. Nice find!

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Nice find! Cool color!

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