Difference: PacsCalibrationWeb (147 vs. 148)

Revision 1482016-12-19 - KatrinaExter

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META TOPICPARENT name="WebHome"

PACS instrument and calibration web pages

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  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.
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  • 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 Info PACS Products Explained, which can also be found on the HIPE help pages.
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  • 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 Info 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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  • The recommended User Release HCSS (Herschel common science system) version that you should use for reducing PACS data is HIPE v14.2.1
  • In the CIB (continuous integration build) this version corresponds to Track 14, build 3597. 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.
  • Within HIPE you can access all the PACS data reduction documentation and the general HCSS and HIPE user documentation for Track 14 here. The documentation provided via HIPE opens in a web browser, but for those of you who prefer PDF, we include the PACS Data Reduction Guides as PDF files here (note that within the standalone pdf versions, external links will not work):
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  • The what's new in HIPE 14 page lists the changes in HIPE version 14.2.1 with respect to the 14.x releases, and provides a detailed list of updated functionalities, product changes, and calibration aspects.
  • The Data products known issues page details issues about the pipelines or the data products that are known about and offers advice for dealing with them. Consult this if you encounter problems with your data to see if it has already been addressed.
  • Link to the General HCSS Public Twiki page (with general framework information and updates): http://herschel.esac.esa.int/twiki/bin/view/Public/WebHome
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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.
  • 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 14.2.1:
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    • There we also include:
      • why we recommend you do re-pipeline your data
      • what you need to pay attention to for different types of astronomical source
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