You are here: Home / Proposing / Duplicate Observations

Duplicate Observations

In order to ensure the most efficient use of ALMA, duplicate observations of the same location on the sky with similar observing parameters (frequency, angular resolution, coverage, and sensitivity) are not permitted unless scientifically justified. Details on the duplication policy are provided in Section 4.4 of the Cycle 8 2021 Proposer's Guide and Section 5.1 of the Users' Policies. It is the responsibility of the Principal Investigator (PI) to check their proposed observations against both the ALMA Archive and the spreadsheet provided below to avoid duplicate observations.

The ALMA Archive contains an up-to-date list of the PI science observations, including Cycle 7 programs that have been started or completed. The spreadsheet "Projects in the Queue” supplements the ALMA archive in that it lists the metadata for Grade A main array science goals, as well as Grade A and B ACA standalone science goals that have not been completed as of 2021 March 11 and are still in the observing queue. The spreadsheet lists the sensitivity and angular resolution that are expected to be achieved assuming the observations are completed in full. Observations for Grade B and C projects that have not been started by 2021 March 11 will not be used in the duplication checks conducted by ALMA even if observations are obtained later in Cycle 7.

The ongoing list of observations is provided in both Excel Workbook (xlsx) and Comma Separated Variable (CSV) text format. It includes one row for each target, rectangular mosaic, or each pointing in custom mosaics. The spreadsheet content is described at the beginning of the file, and includes target names, coordinates, properties of each spectral window, along with the resolution and sensitivity requested by the PI. A link is provided to a user-contributed python script, which contains functions to search, plot, and display source information contained in the list of ongoing observations. Instructions on how to run the script are provided in the script header. The script is made available on an "as-is" basis for convenience and is not supported by the ALMA Regional Centers (ARCs).

ALMA Science Archive QueryProjects in the Queue (Excel spreadsheet)Projects in the Queue (CSV text file)Python Script


Update for the Supplemental Call:

Proposals to the Cycle 8 2021 Supplemental Call will be checked for duplications against the archive as of 2021 August 30, the Cycle 8 2021 Grade A proposals, and the approved Cycle 8 2021 ACA standalone proposals. A list of these Cycle 8 2021 observations is provided in the spreadsheets below. A python script is provided to plot the results.

ALMA Science Archive QueryCycle 8 2021 Projects in the Queue (Excel spreadsheet)Cycle 8 2021 Projects in the Queue (CSV text file)Cycle 8 2021 Python Script