In March, 1999 the proposal to build VERITAS, the Very Energetic Radiation Imaging Telescope Array System, was submitted to the U.S. Department of Energy by Iowa State University, Purdue University, the Smithsonian Astrophysical Observatory, and Washington University. Copies were also sent to the Smithsonian Institution, to the National Science Foundation (by the University of Chicago and the University of Utah), to PPARC in the United Kingdom (by the University of Leeds) and to Enterprise Ireland (by University College, Dublin). At DOE's request the proposal was reviewed by SAGENAP (the Scientific Assessment Group for Experiments in Non-Accelerator Physics); it was also sent by DOE for review by external referees.
The reviews were very positive and we have been encouraged to
proceed with the project. A slightly revised and abbreviated
proposal is now being submitted to these agencies.
Further encouragement comes from the progress in the field as
reported in the Proceedings of the Workshop on the ``TeV Astrophysics
of Extragalactic Sources'' in Cambridge, MA in October, 1998
(Astroparticle Physics, vol. 11) and of the Workshop on ``GeV-TeV
Astrophysics'' in Snowbird, UT in August, 1999 (in press).
In this Addendum we address some of the concerns raised during the
reviewing process in greater detail than was possible in the main
body of the proposal. The Addendum includes: