Not sure what the collective term for cosmic rays is (a 'kaleidoscope' sounds good) ~ this looks like a whole bunch of them

https://www.legacysurvey.org//viewer/?ra=239.2838&dec=51.7537&layer=ls-dr9&zoom=14

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Whoa, perhaps one exposure only…
https://www.legacysurvey.org/viewer/ccd/ls-dr9/mosaic-95382-CCD1.xhtml?rect=1820,3035,100,100
Never seen that many cosmic rays before.
Perhaps some energetic outburst?

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it certainly caught my attention

Me as well

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That’s cool! See how they are all in a narrow vertical strip? That’s because we only have one z-band exposure in that strip, so the outlier-rejection isn’t able to flag them! And that happened to coincide with this strong CR shower.

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