I watched a well defined oval craft, non-reflective gray metallic surface, no fixed or blinking lights just blue halo fly low over GilaI watched the event from my open bedroom window. It was a well defined oval shape with the outer rim showing and what looked like a rounded dome. It had no blinking or fixed lights, had a dull, non reflective gray metallic surface: but there was a dim, blue halo effect around the craft. Traveling very fast from east to west. As it passed it became very quiet out and then after it passed the noise of frogs and bugs resumed. The moon was out, thin transparent clouds but mostly clear. Visibility was excellent. The night was cold. There was a cold slight wind from the south/southwest. I live in a valley, near a river and a wilderness area....quite remote. This object seemed quite low.