Welcome to the IAC Time Allocation Commission proposal submission service. Please visit CAT for news about the proposal submission process and the time allocation of the Commission. Registration is required for proposal submission.
Night time calls
2026 International Time call
International Time 2026
2025A Regular CAT call
Regular CAT all for 2025A night time
Time types available in this call:CATESP CATFLO CATMEX
OT internal time
IAC-only time for telescopes at OT: IAC80, OGS LCO, SARA and Open University
Director Discretionary Time
Director Discretionary Time for ORM telescopes
Spanish Service Time
Spanish Service time for INT, NOT, TCS and the TNG only. The proposals are evaluated by the Spanish Night CAT.
Solar time calls
2024 Solar CAT call
Solar time
2023A Solar CAT call
Time call for the GREGOR telescope