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MISSION CONTROL: Discovery, Houston. Go at throttle up.

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PAM MELROY: Copy. Go at throttle up.

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MISSION CONTROL: The three engines onboard are throttling back up. At liftoff,

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the fully fueled shuttle boosters and external tank weighed 4 ½ million pounds.

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The total thrust at launch was 6,425,000 pounds.

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Discovery now 13 miles downrange at an altitude of 13 statute miles,

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flying at 1,700 miles per hour. All systems continue to function well.

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Three good main engines, three good power-generating fuel cells and

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three good auxiliary power units for the hydraulic system.

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Discovery now 24 miles downrange at an altitude 23 statute miles,

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flying at 2,700 miles per hour. One minute, 58 seconds into the flight,

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standing by for burnout and separation of the solid rocket boosters. Combined,

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the twin boosters provide 5.3 million pounds of thrust to propel the orbiter toward space.

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The booster officer here in Mission Control confirming the booster separation.