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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 5.4 of the Cycle 5 Proposer's Guide and Section 5.2 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 obtained over all cycles. The spreadsheet lists the metadata for ongoing observations that have not been completed as of 2017 March 15, selected from (1) Cycle 3 and Cycle 4 Grade A projects and (2) Science Goals which have been started in Cycle 4 Grade B and C projects. The spreadsheet supplements the ALMA Archive in that it lists the sensitivity and angular resolution that are expected to be achieved assuming the observations are completed in full. Sources in Science Goals for Cycle 4 Grade B and C projects for which observations have not been started by 2017 March 15 are not listed in the spreadsheet and will not be used in the duplication checks conducted by ALMA even if observations are obtained later in Cycle 4.

The ongoing list of observations is provided in both Excel Workbook (xls) 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 xls and csv files. 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 QueryList of ongoing observations (Excel spreadsheet)List of ongoing observations (CSV text file)Python Script