Difference between revisions of "VLBI Tutorials"

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== Tutorials for the Very Long Baseline Array ==
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== Tutorials for Very Long Baseline Interferometry ==
  
CASA is offering increased VLBI support through a collaboration with the Joint Institute for VLBI ERIC (JIVE). The below VLBI CASA tutorials introduce the CASA environment and touch upon the visualization, calibration and imaging capabilities available, along with the scripting methods so that you can create your own calibration scripts for your own data.
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CASA is offering increased VLBI support through a collaboration with the Joint Institute for VLBI ERIC (JIVE).  
  
VLBI processing in CASA has been extensively tested with EVN and VLBA continuum data. Other use cases and telescopes are still being verified. Feedback on results (also successful ones) and missing or optimizing functionality is very welcome at casa_feedback_at_nrao.edu.
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CASA can be used to process VLBA continuum data, but development and testing are ongoing and NRAO currently recommends using AIPS for all VLBA data. VLBI processing in CASA has been extensively tested with EVN continuum data. Other use cases and telescopes are still being verified. Feedback on results (also successful ones) and missing or optimizing functionality is very welcome at casa_feedback_at_nrao.edu.
  
For the Event Horizon Telescope (EHT) project, one of three certified pipelines is based on CASA. This 'rPicard' pipeline has since evolved into a generic all-purpose pipeline for VLBI processing. While rPicard is not supported by the CASA team, users can find more information in [https://arxiv.org/abs/1905.01905 this paper].
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The below EVN CASA tutorials introduce the CASA environment and touch upon the visualization, calibration and imaging capabilities available, along with the scripting methods so that you can create your own calibration scripts for your own data.
  
 +
For the Event Horizon Telescope (EHT) project, one of three certified pipelines is based on CASA. This 'rPicard' pipeline has since evolved into a generic all-purpose pipeline for VLBI processing. While rPicard is not supported by the CASA team, users can find more information in [https://arxiv.org/abs/1905.01905 Janssen et al. (2019)].
  
== <font size = 3> '''CASA tutorials''' ==
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== <font size = 3> '''VLBA AIPS tutorials''' ==
  
 
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CASA tutorial: [http://www.jb.man.ac.uk/DARA/unit4/Workshops/EVN_continuum.html ENV Continuum Imaging & Calibration]
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While a tutorial for processing VLBA data in CASA is under development, we also include below two AIPS tutorials on this topic.
  
CASA tutorial: [http://www.jb.man.ac.uk/DARA/unit4/Workshops/Spectral_line.html EVN HI Spectral Line]
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AIPS tutorial: [https://casaguides.nrao.edu/index.php/AIPS-Simple-Self-Cal Simple Self-Calibration]
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AIPS tutorial: [https://casaguides.nrao.edu/index.php/AIPS-Spectral_Lines_and_Astrometry Spectral Lines and Astrometry]
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== <font size = 3> '''VLBA CASA Calibration Procedure''' ==
  
Credits: These CASA tutorials represent publicly available materials developed by scientists from the University of Manchester, the Joint Institute for VLBI ERIC (JIVE), and the University of Pretoria/SARAO through funding from Development in Africa with Radio Astronomy (DARA). The materials are based upon a workshop developed by Anita Richards (University of Manchester) in 2016. The subsequent update has been conducted by Jack Radcliffe (SARAO/ University of Pretoria), which has been influenced by Des Small's (JIVE) [http://jive.nl/~small/FringeFitting/n14c3_tutorial.html EVN CASA tutorial], based on AIPS material provided by Minnie Mao. When starting with archival EVN observations, this [http://jive.nl/~small/FringeFitting/n14c3_tutorial.html EVN CASA tutorial] explains the required steps for converting the data into a Measurement Set (in the EVN Continuum tutorial these steps are not complete). Thanks to Ilse van Bemmel (JIVE) for making these materials available for the CASA Guides.
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The following document describes the procedure for calibrating VLBA phase-referenced observations with CASA, including self-calibration.
  
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VLBA Data Calibration with CASA: [https://library.nrao.edu/public/memos/vlba/sci/VLBAS_38.pdf VLBA Scientific Memo #38]
  
== <font size = 3> '''Old AIPS tutorials''' ==
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== <font size = 3> '''EVN CASA tutorials''' ==
  
 
<font size = 2>
 
<font size = 2>
While implementation of VLBI data processing is an ongoing effort in CASA, we also include below two old AIPS tutorials on this topic.
+
CASA tutorial: [http://www.jb.man.ac.uk/DARA/unit4/Workshops/EVN_continuum.html EVN Continuum Imaging & Calibration]
  
AIPS tutorial: [https://casaguides.nrao.edu/index.php/AIPS-Simple-Self-Cal Simple Self-Calibration]
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CASA tutorial: [http://www.jb.man.ac.uk/DARA/unit4/Workshops/Spectral_line.html EVN HI Spectral Line]
  
AIPS tutorial: [https://casaguides.nrao.edu/index.php/AIPS-Spectral_Lines_and_Astrometry Spectral Lines and Astrometry]
+
Credits: These CASA tutorials represent publicly available materials developed by scientists from the University of Manchester, the Joint Institute for VLBI ERIC (JIVE), and the University of Pretoria/SARAO through funding from Development in Africa with Radio Astronomy (DARA). The materials are based upon a workshop developed by Anita Richards (University of Manchester) in 2016. The subsequent update has been conducted by Jack Radcliffe (SARAO/ University of Pretoria), which has been influenced by Des Small's (JIVE) [http://jive.nl/~small/FringeFitting/n14c3_tutorial.html EVN CASA tutorial], based on AIPS material provided by Minnie Mao. When starting with archival EVN observations, this [http://jive.nl/~small/FringeFitting/n14c3_tutorial.html EVN CASA tutorial] explains the required steps for converting the data into a Measurement Set (in the EVN Continuum tutorial these steps are not complete). Thanks to Ilse van Bemmel (JIVE) for making these materials available for the CASA Guides.

Latest revision as of 12:55, 3 December 2021

Tutorials for Very Long Baseline Interferometry

CASA is offering increased VLBI support through a collaboration with the Joint Institute for VLBI ERIC (JIVE).

CASA can be used to process VLBA continuum data, but development and testing are ongoing and NRAO currently recommends using AIPS for all VLBA data. VLBI processing in CASA has been extensively tested with EVN continuum data. Other use cases and telescopes are still being verified. Feedback on results (also successful ones) and missing or optimizing functionality is very welcome at casa_feedback_at_nrao.edu.

The below EVN CASA tutorials introduce the CASA environment and touch upon the visualization, calibration and imaging capabilities available, along with the scripting methods so that you can create your own calibration scripts for your own data.

For the Event Horizon Telescope (EHT) project, one of three certified pipelines is based on CASA. This 'rPicard' pipeline has since evolved into a generic all-purpose pipeline for VLBI processing. While rPicard is not supported by the CASA team, users can find more information in Janssen et al. (2019).

VLBA AIPS tutorials

While a tutorial for processing VLBA data in CASA is under development, we also include below two AIPS tutorials on this topic.

AIPS tutorial: Simple Self-Calibration

AIPS tutorial: Spectral Lines and Astrometry

VLBA CASA Calibration Procedure

The following document describes the procedure for calibrating VLBA phase-referenced observations with CASA, including self-calibration.

VLBA Data Calibration with CASA: VLBA Scientific Memo #38

EVN CASA tutorials

CASA tutorial: EVN Continuum Imaging & Calibration

CASA tutorial: EVN HI Spectral Line

Credits: These CASA tutorials represent publicly available materials developed by scientists from the University of Manchester, the Joint Institute for VLBI ERIC (JIVE), and the University of Pretoria/SARAO through funding from Development in Africa with Radio Astronomy (DARA). The materials are based upon a workshop developed by Anita Richards (University of Manchester) in 2016. The subsequent update has been conducted by Jack Radcliffe (SARAO/ University of Pretoria), which has been influenced by Des Small's (JIVE) EVN CASA tutorial, based on AIPS material provided by Minnie Mao. When starting with archival EVN observations, this EVN CASA tutorial explains the required steps for converting the data into a Measurement Set (in the EVN Continuum tutorial these steps are not complete). Thanks to Ilse van Bemmel (JIVE) for making these materials available for the CASA Guides.