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 Regular CAT call
Regular night time call for 2026B, including GTC, TNG, WHT, INT, NOT, Stella, LT, TCS, TTT, and Mercator
Time types available in this call:CATCHI CATESP CATFLO CATMEX IACFLO
2026 International Time call
International Time 2026
2026A IAC internal time call
IAC-only time for telescopes : IAC80, OGS LCO, SARA and Open University
Spanish Service Time
Spanish Service time for TNG, NOT, TCS and IAC80 only. The PI of the IAC80 proposals must affiliated to the IAC.
Solar time calls
2026A Solar CAT call
Spanish solar time for the 2026 campaign (SST and THEMIS) and 2026 first semester (GREGOR)