by Tom_Collett scientist
This could be a lens. It's got a blue source near a red/yellow galaxy, and the blue source looks like it's been distorted into an arc. However there isn't an obvious 'counter image.' Which is where a second image of the lensed source forms on the other side of the lensing galaxy. If that was there it would be a smoking gun. As it is, it's an interesting candidate, but it could still be a chance alignment of two (unlensed) galaxies.
These are the sort of things we definitely want to be tagging!