The side boosters executed a 20 degree roll program with a rate of 30dps, beginning at T+0.9. Initial pitch-over of the vehicle at launch was due to thrust inconsistencies between booster motors. Because of a low level coordinate transformation error in its flight software, the center core flew with poor stability, correcting roughly 20 degrees off axis for both pitch and yaw. Photos from the flight can be found here: https://bps.space/gallery/ For more info: https://twitter.com/joebarnard http://www.bps.space