Supernova (the red thing is not in any other surveys)


If you click on the map and follow the “Single exposures” link in the popup (https://www.legacysurvey.org/viewer/exposures/?ra=147.3055&dec=1.1794&layer=ls-dr9), you will see all the individual exposures we took of this chunk of sky, in the “g” (blue), “r” (green) and “z” (red) filters. The bottom three are z – and you can see it slightly in all three, taken in 2016, 2017, 2018 – so not a supernova.

I think it doesn’t appear in SDSS because it’s quite red. The SDSS images show the g, r and i bands (rather than z band), and i is not as red as z; for a very red source, you would expect it to show up more strongly in the Legacy Surveys images. Plus they’re way deeper overall.

cheers,
–dustin

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That is not a #supernova but an #artifact.

Ine :stars::dizzy:

Screenshot_20210302-194118_Chrome

Oh, you’re right!, I missed that there were two nearby blobs in the image, one extremely red – the artifact.

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