spaceflightnow.com
1555 GMT (11:55 a.m. EDT)
T+plus 40 minutes, 30 seconds. Atlantis has completed the OMS burn.
A quick review of video from the external tank-mounted camera shows a couple of very small pieces of debris shedding from the tank well after solid rocket booster separation. So far, it looks like Atlantis had a clean ascent.