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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 9, 2026
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License

MIT License (MIT)

Requires

Python >=3.9

Provides Extra

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