If you are looking at a circle that is a cone of light. Couldn't this be is big radio burst on the other side of something with a lot of mass? A normal spherica

If you are looking at a circle that is a cone of light. Couldn't this be is big radio burst on the other side of something with a lot of mass? A normal spherical expansion of an explosion when going past a massive object would obscure the centre and bend some light to form a circle. Don't see what that isn't one of the suggested theories. Galaxy in the middle might not be the source, just the mass that's doing the bending of the radio waves.