With me, it is just a trick of the light on a misty morning. The early sun creates two separate rainbows when you look directly away from the morning sun (ie, at your shadow).
The first you can see here is spherical, centered around where the camera lens would be on my shadow. It is just a circular rainbow, formed by sunlight scattering through ice and mist rising from melting frost. The second is a large white rainbow (out of view), roughly the size of a normal coloured rainbow. Unlike normal rainbows, neither comes with a pot of gold.