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AVICA: Automated VLBI pipeline in CASA

Accepted for publication in Astronomy & Astrophysics journal.

asciicast

Full documentation: https://avica.readthedocs.io/en/latest/

Contents

Installation

Requirements:

  • Ubuntu 18.04+, Debian 10+, or RHEL/CentOS 8+
  • Python >= 3.9

The avica package is publicly available on PyPI. Use uv or pipx for an isolated command-line installation.

Recommended installation

Using uv:

uv tool install avica --python 3.10

Using pipx:

pipx install avica

Using pip:

pip install avica

If you install with pip, use a virtual environment unless you already manage Python packages another way.

Manual installation

Clone the repository and install it locally:

git clone https://github.com/avikhagol/avica.git
cd avica/
pip install .

Usage

The pipeline calibration steps rely on rPicard. Follow the rPicard setup instructions first. After rPicard is configured, AVICA only needs a minimal configuration file to get started; see Configuration.

Pipeline

Run the default pipeline:

avica pipe run --fitsfilenames <file1.uvfits,file2.uvfits> --target <source-name>

The default pipeline executes these steps:

  • preprocess_fitsidi
  • fits_to_ms
  • phaseshift
  • avica_avg
  • avicameta_ms
  • avica_snr
  • avica_fill_input
  • avica_split_ms
  • rpicard

You can pass one or more step names to run only part of the pipeline:

avica pipe run preprocess_fitsidi fits_to_ms --fitsfilenames <file.uvfits>

Common options:

Option Description
--f, --fitsfilenames Comma-separated FITS-IDI file names.
--t, --target Selected field or source name.
--configfile Configuration file containing key=value entries. Defaults to avica.inp.
--help Show the full command help.

Manipulating FITS-IDI

Check FITS-IDI files for known issues:

avica fitsidi_check <file.uvfits>

Useful options:

Option Description
--fix, --no-fix Apply available fixes. Defaults to --no-fix.
--desc, --no-desc Show issue descriptions. Defaults to --no-desc.
--help Show the full command help.

Example output:

avica fitsidi_check VLBA_VSN005412_file3.uvfits
+--------------------+---------+-------+-------+----------------+----------+
| hdu                | fixable | total | fixed | problem_code   | affected |
+==========================================================================+
| ARRAY_GEOMETRY     | 0       | 8     | 0     | []             | []       |
| ANTENNA            | 0       | 16    | 0     | []             | []       |
| FREQUENCY          | 0       | 8     | 0     | []             | []       |
| PHASE-CAL          | 0       | 12    | 0     | []             | []       |
| PRIMARY            | 1       | 10    | 0     | ["extra_byte"] | [""]     |
| SOURCE             | 0       | 8     | 0     | []             | []       |
| FLAG               | 0       | 12    | 0     | []             | []       |
| UV_DATA            | 0       | 8     | 0     | []             | []       |
| GAIN_CURVE         | 0       | 8     | 0     | []             | []       |
| SYSTEM_TEMPERATURE | 0       | 8     | 0     | []             | []       |
+--------------------+---------+-------+-------+----------------+----------+

List observation information:

avica listobs <file.uvfits>

Configuration

The pipeline configuration is a key=value file. By default, AVICA looks for avica.inp in the current directory. See the example configuration for a minimal setup.

Pass a custom configuration file with --configfile:

avica pipe run --configfile <path/to/config/file>

If --configfile is not provided, AVICA uses avica.inp by default.

To store defaults persistently, create ~/.avica/avica.inp from an existing file:

avica pipe config --default --inpfile <path/to/avica.inp>

You can also set default values directly:

avica pipe config --default key=value key2=value2 key3=value3

To set global defaults in AVICA's installed directory, use --global in the same way:

avica pipe config --global --inpfile <path/to/avica.inp>
avica pipe config --global key=value key2=value2 key3=value3

Attribution

When using AVICA, please add a link to this repository in a footnote.

Acknowledgement

AVICA was developed within the "Search for Milli-Lenses" (SMILE) project. SMILE has received funding from the European Research Council (ERC) under the HORIZON ERC Grants 2021 programme (grant agreement No. 101040021).

Project links

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  • Released:
Newer release available (0.3.1.10)

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Credits

Author: Avinash Kumar

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Data verified by PyPI on Jul 21, 2026
The GitHub source repository was provided by the project maintainers and verified by PyPI at the time of upload. Stars, forks, and open issues/PRs are derived from that repository and have not been independently verified.

License

MIT License (MIT)

Requires

Python >=3.9

Provides Extra

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