"In astronomy, an Odd Radio Circle (ORC) is a very large, (Over 50 thousand times the diameter of our very own Milky Way ~ 3 Million Light-years) unexplained astronomical object that, at radio wavelengths, is highly circular and brighter along its edges."

I can't wait to see what the JWST makes of these. Possibly the burst of radiation came from the collision of two super-massive black holes. The merging shouldn't be discernible because they are black holes. However, the accretion disks are moving near the speed of light. What happens when those collide? And what matter is in open space that would emit radio waves from synchrotron radiation?

[en.wikipedia.org]