The Caltech Submillimeter Observatory is operated by the California Institute of Technology.

Observations after 2013 April 1, wholly

Observations before 2013 April 1, in whole or in part

Until 2013 March 31, the CSO was operated by Caltech under cooperative agreement with the National Science Foundation (AST-0838261).

As stated in the NSF Award and Administration Guide, the NSF has specific requirements for acknowledgment of support. These requirements are incumbent on all observers. To satisfy these requirements: