At around T+72 seconds, the right SRB apparently pulled away from the aft strut attaching it to the external tank. Later analysis of telemetry data showed a sudden lateral acceleration to the right at T+72.525 seconds, which may have been felt by the crew.
About 72 seconds into the mission, the right solid rocket booster (SRB) broke free from its connection to the external fuel tank. Further examination of flight data indicated a sharp turn to the right at approximately 72.525 seconds, possibly felt by the astronauts on board.