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PACS instrument and calibration web pages

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PACS calibration and performance

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Data processing known issues of standard products for photometry and spectroscopy:

The Herschel Science Archive provides bulk-processed Level 2/2.5 products. This Data Processing Known Issues page describes typical problems and caveats the observer needs to be familiar when looking at the results of this "SPG" (standard product generation) processing. Aspects of product quality which can be further optimised by interactive processing are also summarised here. The document refers to the version of data processing pipeline currently being used for processing of incoming Herschel data.

 

Photometer calibration in scan maps

  • Point Spread Function/Encircled Energy Fraction : PACS Photometer Point Spread function (10 Mb), version 2.2, 16 November 2015. A detailed document of the in-flight observed PSF and of the derivation of the EEF curves. The accompanying TAR file can be downloaded here (79 MB). It contains the Vesta PSFs FITS files and the EEF tables for all the scanning modes.
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PACS calibration file versions

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  • When starting HIPE, you will be informed if new calibration files are available. Clicking on 'show details' will show you the release note of the new calibration set, with details about the changes. This is further explained in the PDRGs. Clicking on 'Install' will install the latest calibration files.
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  • When starting HIPE, you will be informed if new calibration files are available. Clicking on show details will show you the release note of the new calibration set, with details about the changes. This is further explained in the PDRGs. Clicking on Install will install the latest calibration files.
 
  • You can inspect the release notes for the calibration sets installed on your machine from within HIPE. Open the Calibration Sets View from the menu Window -> Show Views -> Workbench.
  • The history of the calibration files that have been released to the community is provided here: PACS Calibration File History.

Reducing PACS data

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A brief introduction to reducing PACS data in HIPE. You can consult the PACS Data Reduction Guides (photometry and spectroscopy; available via HIPE) for more detail.
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Standard Products

The Herschel Science Archive provides bulk-processed Level 2/2.5 products for photometry and spectroscopy.

  • This Data Processing Known Issues page describes typical problems and caveats the observer needs to be familiar when looking at the results of this "SPG" (standard product generation) processing. Aspects of product quality which can be further optimised by interactive processing are also summarised here. The document refers to the version of data processing pipeline currently being used for processing of incoming Herschel data.
 
  • For a explanation of PACS products, i.e. what you get when you download a complete or part of an observation from the HSA, see the PACS Products Explained, which can also be found on the HIPE help pages.
  • PACS data are reduced with pipeline scripts which are a set of command-line tasks that process the data from Level 0 (raw) to Level 2/2.5 (science-ready). There is more than one flavour of pipeline script, tailored to different types of science target, AOT, and observing plan. These 'interactive' pipeline scripts are provided in HIPE and explained in the data reduction guides.
  • The data you get from the the HSA will have been processed by the 'SPG' (Standard Product Generator) using one pipeline script flavour per AOT. Which script is used is documented in the PDRG.
  • The SPG scripts include all the stable pipeline tasks within those scripts, with task settings that correspond to the most common type of science target for each AOT. But some pipeline tasks still can only be run via the interactive pipeline scripts, and to modify the parameter settings for the important pipeline tasks also requires you re-process the data. The Launch Pads (see below) include a guide to understanding the pipeline scripts and how to decide whether to reprocess your data and if so, with which script.
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Data reduction: HIPE, documentation, and useful links for data issues

 
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HIPE, data reduction documentation, and useful links for data issues

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HIPE (Herschel Interactive Processing Environment) is the tool used to inspect, reduce, and analyse Herschel data.
 
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  • HIPE (Herschel Interactive Processing Environment) is the tool used to inspect, reduce, and analyse Herschel data. The latest User Release HCSS (Herschel common science system) version that you should use for reducing PACS data is HIPE v14.2 It can be downloaded from: here. In the CIB (continuous integration build) this version corresponds to Track 14, build 3595. The CIB is the continuously bug-fixed/upgraded/improved version of HIPE, which every few months (in the beginning of the mission) or yearly (in the post-operations phase) becomes a stable User Release.
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  • The recommended User Release HCSS (Herschel common science system) version that you should use for reducing PACS data is HIPE v14.2
  • In the CIB (continuous integration build) this version corresponds to Track 14, build 3595. The CIB is the continuously bug-fixed/upgraded/improved version of HIPE, which every few months (in the beginning of the mission) or yearly (in the post-operations phase) becomes a stable User Release.
 
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  • The what's new in HIPE 14 page lists the changes in HIPE version 14.2 with respect to the 14.0 series, and provides a detailed list of updated functionalities, product changes, and calibration aspects.
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  • The what's new in HIPE 14 page lists the changes in HIPE version 14.2 with respect to the 14.0, and provides a detailed list of updated functionalities, product changes, and calibration aspects.
 

Cookbooks and interactive pipeline scripts

  • The various interactive pipeline scripts PACS photometry and spectroscopy provide in HIPE can be seen as cookbooks, since they take you through each pipeline, task by task, explaining briefly what each task does, commenting on the more crucial pipeline tasks, and showing you how to plot, image, visualise and inspect your data as you work through the pipeline. An example public observation is included with each so you can test it out before using it on your data. These data reduction scripts are available in HIPE under the menu: Pipeline --> PACS --> Photometer/Spectrometer.
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  • The PACS Launch Pad from HIPE 14 for photometry is provided here. The PACS Launch Pad from HIPE 14 for spectroscopy is provided here. These are taken from the first chapters of the respective PDRGs and are a useful quick-start guide to loading your data into HIPE, looking at them, and then what to know and do before you begin reprocessing your data with one of the pipelines. Also included is
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  • The PACS Launch Pads are taken from the first chapters of the respective PDRGs and are a useful quick-start guide to loading your data into HIPE, looking at them, and then what to know and do before you begin reprocessing your data with one of the pipelines. From HIPE 14.2:
 
    • why we recommend you do re-pipeline your data
    • what you need to pay attention to for different types of astronomical source
    • what the crucial pipeline tasks are
 
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