tokens: P.E.H. acknowledges support from NSF awards AST-0506666 and AST-0908010 and NASA/ATP awards NNX08AG83G and NNX12AH06G to the University of Alabama. This work made use of the Swinburne University of Technology software correlator, developed as part of the Australian Major National Research Facilities Programme and operated under license. Earth Orientation and Ionospheric data hosted on the Crustal Dynamics Data Information System (CDDIS) at the NASA Goddard Space Flight Center were used in this project. This study makes use of 43 GHz VLBA data from the VLBA-BU Blazar Monitoring Program (VLBA-BU-BLAZAR; http://www.bu.edu/blazars/VLBAproject.html ), funded by NASA through the Fermi Guest Investigator Program. C.L. and F.B.D. were summer students at the NRAO when they became involved in this project.
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