Welcome to the IAC Time Allocation Commission proposal submission service. Please visit CAT for additional information and news about the proposal submission process and the time allocation of the Commission. Both the principal investigator and all co-investigators must be registered to submit proposals. If you already have an account please log in to view and submit proposals.
If you are facing technical difficulties with the application, you can contact us at helpdesk-cat@iac.es.
Night time calls
2026B Spanish CAT call
Regular call for 2026B
2026A IAC internal time call
IAC-internal time for telescopes: IAC80, OGS, LCO, SARA and Open University
2026 International Time call
International Time 2026
Solar time calls
2026A Solar CAT call
Solar Time for 2026A