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Call for Proposals

The ALMA Director, on behalf of the Joint ALMA Observatory (JAO) and the partner organizations in East Asia, Europe, and North America, is pleased to announce the ALMA Cycle 5 Call for Proposals (CfP) for scientific observations to be scheduled from October 2017 to September 2018. It is anticipated that 4000 hours of the 12-m Array time and 3000 hours of the Atacama Compact Array (ACA) time, also known as the Morita Array, will be available for successful proposals from Principal Investigators (PIs) in Cycle 5.


ALMA Cycle 5 proposal submission will open at

15:00 UT on Tuesday, 21 March 2017


The Cycle 5 proposal submission deadline is

15:00 UT on Thursday, 20 April 2017


The key dates for Cycle 5 are given in the following Table. 

Table 1: The ALMA Cycle 5 Timeline

21 March 2017 (15:00UT) Release of Cycle 5 Call for Proposals, Observing Tool & supporting documents and Opening of the Archive for proposal submission
20 April 2017 (15:00UT) Proposal submission deadline
End of July 2017 Announcement of the Outcome of the Proposal Review Process
August-September Submission of Phase 2 Scheduling Blocks by PIs
October 2017 Start of ALMA Cycle 5 Science Observations
September 2018 End of ALMA Cycle 5


Proposers are invited to carefully read the following documentation available for download from the ALMA Science Portal (

Table 2: Documentation supporting Cycle 5 ALMA Call for Proposals

ALMA Proposer's Guide Contains all pertinent information regarding the ALMA Call for Proposals
ALMA Technical Handbook A comprehensive description of the ALMA observatory and its components
ALMA Users' Policies The long-term core policies for use of the ALMA and ALMA data by the science community
Observing With ALMA - A Primer Introduction to interferometry and how to use ALMA
ALMA Proposal Review Process An updated ALMA Principles of the ALMA Proposal Review Process


Proposals must be prepared and submitted using the ALMA Observing Tool, which is available for download from the ALMA Science Portal ( Proposals will be assessed by competitive peer review by a single international review committee.

Obtaining Help

For information not provided at the Science Portal, proposers may submit a Helpdesk ticket. Registration at the ALMA Science Portal is required for Helpdesk ticket submission.