ALMA is pleased to announce that a web-based interface of the ALMA Observing Tool (OT) will replace the previously used desktop-based OT for the Cycle 13 Call for Proposals. The web-based OT offers the same functionality as the desktop-based OT. The new interface offers a modernized and optimized view while retaining the same familiar workflow and structure. Proposal drafts will now be automatically saved within the system, without the need to save local files.
Introducing the new web-based ALMA Observing Tool (OT)
Published: 18 Mar 2026
As always, users are strongly encouraged to submit their proposals early. This allows users to ensure that their proposals are correctly set up for successful submission, and allows time to seek support from local ARC staff if needed. While this has also been the guidance in previous cycles, Cycle 13 proposers may want to give this guidance special consideration while they gain familiarity with the web-based OT.
More details about the web-based OT is available in the Call for Proposals documentation.