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1mm VLBI Call for Proposals is Now OPEN

Mar 25, 2016

The Joint ALMA Observatory (JAO) and the National Radio Astronomy Observatory (NRAO) invite proposals for 1mm Very Long Baseline Interferometry (VLBI) using the phased output of the Atacama Large Millimeter/submillimeter Array (ALMA) and the Event Horizon Telescope (EHT) during ALMA Cycle 4. Up to 5% of ALMA Cycle 4 observing time is available for VLBI, shared between 1mm and 3mm. Note that the EHT without phased ALMA is not being offered as part of this Call.

The submission deadline for 1mm VLBI proposals is Thursday, 28 April 2016, at 23:59 UT.

An overview of phased ALMA and the EHT and further technical information to support proposal preparation is available at:

The same proposal (including scientific and technical justification) must be submitted in response to this Call for Proposals as that submitted to the ALMA Cycle 4 Call to request phased ALMA and the NRAO/EHT. Proposal preparation is therefore through the ALMA Observing Tool (OT), which requires registration through the ALMA Science Portal beforehand. The ALMA OT Quickstart Guide provides more information on how to use OT. Proposers will then submit a PDF copy of their full ALMA Cycle 4 proposal through the 1mm VLBI Proposal Submission website by the above deadline. Additional information on proposing to ALMA may be found in the ALMA Cycle 4 Proposer's Guide.

Proposers who need assistance with proposal preparation or have questions regarding the Call should contact ALMA staff at the ALMA Helpdesk ( For technical questions about the NRAO/EHT network, proposers should contact NRAO staff via the NRAO Helpdesk (