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KENNEDY SPACE CENTER, FLA. - With four rows of payload transfer canister segments in place around the plastic-wrapped Swift spacecraft, Boeing technicians lower the top into place. The top holds an additional cover that will be lowered into place over the canister. The launch of the Swift observatory, a NASA spacecraft to pinpoint the location of gamma-ray bursts, is scheduled for Nov. 17 from Pad 17-A on CCAFS. Liftoff aboard a Boeing Delta II rocket is targeted at the opening of a one-hour launch window beginning at 12:09 p.m. EST. Gamma-ray bursts are distant, yet fleeting explosions that appear to signal the births of black holes. They are the most powerful explosions known in the universe, emitting more than 100 billion times the energy that the Sun emits in a year. Yet they last only from a few milliseconds to a few minutes, never to appear in the same spot again.