
https://www.legacysurvey.org//viewer/?ra=60.1182&dec=-25.1888&layer=ls-dr9&zoom=16
Just a tiny one seemingly. Only visible DR9 and one image in single exposures.

https://www.legacysurvey.org//viewer/?ra=60.1182&dec=-25.1888&layer=ls-dr9&zoom=16
Just a tiny one seemingly. Only visible DR9 and one image in single exposures.
What you need to worry about is that the time of the exposure. Always cleck the dates before considering as a transient candidate, as I learned from Ine Theunisen.
In this case, this is likely a cosmic ray which was not masked by processing software.
Chris