a flare? the station?

Popped outside to check sky conditions. Lots of glow in the west from the Moon, even though it is blocked by the houses to the west.

As I rounded the corner of my house, I saw a very bright white light in the sky, the brightest, about 30° up, moving slowly to the north. And, almost immediately, it began to fade.

Did I catch the tail end of an ISS flyover?

Nope. Heavens-Above says it was the Iridium 57 satellite!

Time: 23:26:51 to 23:26:52.
Magnitude: -7.
Altitude: 31°.
Azimuth: 249° (WSW).

The quick flare was just left of Denebola. And Denebola was 31° up and at azimuth 261.

Good timing!