https://www.legacysurvey.org//viewer/?ra=148.4921&dec=-84.1892&layer=ls-dr10&zoom=13
i click on these blue objects a lot and simbad usually says white dwarf. simbad didnt have anything for this object.
i didnt even look at single exposures but it seems to be transient.
originally when I saw it I hadnt even considered it part of a galaxy. kinda out in the open.
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https://www.legacysurvey.org//viewer/?ra=122.0248&dec=-83.9684&layer=ls-dr10&zoom=12
this is a white dwarf candidate nearby. the type of object I thought I was seeing
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You can see from the single exposures that it appears out of nowhere, so it will be a nova/SN of some kind
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Hi, 
You got it right. It is a supernova. Supernova AT 2019aarj.
https://www.wis-tns.org/object/2019aarj
Kind regards from Ine 
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I had looked it up in TNS but it didnt show anything previously. I think I may have missed the negative symbol in front of dec number.