CAT/IAC-DEV

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. Registration is required for proposal submission. Already have an account? Please log in to view and submit proposals.

Night time calls

2026 International Time call

International Time 2026

Closed Will open for proposals on Thursday 15th of January 2026 00:00

2026A IAC internal time call

IAC-only time for telescopes : IAC80, OGS LCO, SARA and Open University

Open Deadline: Friday 31st of October 2025 23:59

2026A Regular CAT call

Regular call for 2026A

Time types available in this call:
CATCHI CATESP CATMEX

Open Deadline: Friday 31st of October 2025 23:59

2025A Regular CAT call

Regular CAT all for 2025A night time

Time types available in this call:
CATESP CATFLO CATMEX

Evaluating Deadline: Friday 27th of June 2025 23:59 (past)

Director Discretionary Time

Director Discretionary Time for ORM telescopes

Open

Spanish Service Time

Spanish Service time for TNG, NOT and the TCS only. The proposals are evaluated by the Spanish Night CAT.

Open

Solar time calls

2024 Solar CAT call

Solar time

Evaluating Deadline: Saturday 1st of June 2024 12:00

2023A Solar CAT call

Time call for the GREGOR telescope

Evaluating Deadline: Wednesday 31st of July 2024 12:00