This attribute is used to adjust centering; it is applied only if AutoCenterBurn is set to true.
Astrogator <Satellite Object Path> SetValue <Attribute Path>.BurnCenterBias <Value> {[Units]}
Enter the value by which to adjust the centering of the burn. A positive value will center the burn after the previous segment ends by the amount specified. The bias ranges from minus the duration value to positive half of the duration value.
Astrogator */Satellite/Satellite1 SetValue MainSequence.SegmentList.Maneuver.FiniteMnvr.BurnCenterBias 1 min
STK Programming Interface 11.0.1