spaceflightnow.com
1421 GMT (10:21 a.m. EDT)
LOX LOADING BEGINS. Cryogenic liquid oxygen, chilled to Minus-298 degrees F, has started flowing from the storage reservoir at Complex 17, through plumbing and into the bottom of the ULA Delta 2-Heavy rocket. The LOX will be consumed by the first stage main engine during the first four-and-a-half minutes of flight along with the 10,000 gallons of RP-1 kerosene already loaded aboard the vehicle.
1605 GMT (12:05 p.m. EDT)
LIFTOFF! Liftoff of the Delta 2-Heavy rocket with NASA’s new gamma ray observatory, seeking out the extreme objects in the universe!