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Cycle 8 Supplemental Call

In Cycle 8 2021, ALMA will offer an ACA stand-alone Supplemental Call for Proposals. Proposals can be submitted starting 8 September 2021 15:00 UT with a proposal deadline of 6 October 2021 15:00 UT. Since the Supplemental Call will follow the Main Call by five months, the Supplemental Call will maximize the scientific output of the ACA by allowing more timely science to be proposed. Proposals accepted in the Supplemental Call will be scheduled for observations between January 2022 and September 2022.

Capabilities and Time Available

The Supplemental Call is open to Regular Proposals (i.e., no Large Programs) that propose to use standard observing modes, as allowed for ACA standalone proposals in the Main Call. Proposals may request to use the 7-m Array only or the 7-m Array plus Total Power array. The amount of observing time to be allocated in the Supplemental Call will be announced in the Supplemental Call for Proposals.

Anticipated Timeline (all dates subject to change) 

December 2020

Cycle 8 2021 Pre-Announcement (Main Call and Supplemental Call)

8 September 2021 15:00 UT Release of the Cycle 8 2021 Stand-alone ACA Supplemental Call for Proposals, Observing Tool, and supporting documents, and opening of the Archive for proposal submission
6 October 2021 15:00 UT Deadline to submit Supplemental Call proposals
December 2021 Announcement of the outcome of the proposal review process and start of Phase 2 for accepted proposals
January 2022 Start of Science Observations
30 September 2022 End of ALMA Cycle 8 2021



Proposals accepted in the Cycle 8 2021 Supplemental Call will receive priority Grade “C”.

Peer Review Process

As in the Main Call, proposals submitted in the Supplemental Call will be peer reviewed using a distributed system in which each proposal team selects a designated reviewer to participate in the review process. Click here for more details about the distributed review process.