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Revision 422011-12-13 - EdwardPolehampton

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META TOPICPARENT name="WebHome"

SPIRE instrument and calibration web pages

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Introduction

This page provides up-to-date information about using the SPIRE instrument: from preparing observations to reducing your data. This page also provides you with the latest calibration accuracies and known SPIRE calibration issues.
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FTS Spectrometer

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Spectrometer

 
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Reducing SPIRE data

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Software and Documentation

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Software and documentation

 
  • HIPE (Herschel Interactive Processing Environment): The latest User Release HCSS version that you should use for reducing SPIRE data is HIPE v7.0.0. It can be downloaded from: http://herschel.esac.esa.int/HIPE_download.shtml. FYI: this corresponds to the so-called CIB (continuous integration build) HIPE 7.0 build 1931.
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Photometer

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Photometer data reduction

 
Maps
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  In both cases, you need to re-reduce the data with the tips suggested below.
  • The list of observations used to build the Level 2.5 maps are included in the observations' metadata.
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Solar System Objects
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Solar System objects
 
  • When the target is a Solar System Object (SSO) having a proper motion, the spacecraft re-adjusts its position after each scan, in order to always be centred on the target. However, the products retrieved from the Herschel Science Archive have been reduced using a standard pipeline which does not correct for the target's proper motion. As a result, the background of SSO observations will be focused while the SSO itself will appear blurred (for short observations or slow objects) or as a streak (for longer ones or faster objects).
  • As of HIPE 8.0, a new script named SSO_MotionCorrection is available under the SPIRE Useful Scripts menu. The script computes the SSO speed in RA & Dec coordinates, applies the required shift to Level 1 timelines, computes the corrected maps and eventually saves the modified products to a local pool. The results are maps centred on the SSO (i.e. the target will appear focused) with a smooth/blurred background. More details can be found in the SPIRE Data Reduction Guide.
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  For the time being, you can use the jython script written by G. Bendo bendoSourceFit_v0.9.py: it will fit a Gaussian function to the baseline-subtracted SPIRE timelines in a SpireListContext.
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Example Use
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Example use
  This example is based on fitting the peak of Gamma Dra in ObsID 0x50005984 in the PSW band.
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 See the comments at the beginning of the code to learn how to select optional functions, set parameters for the fits, or get additional data based on the resulting fits (e.g. uncertainties in the best fitting parameters).
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FTS Spectrometer

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Spectrometer data reduction

  The best source of information for reducing SPIRE Spectrometer data is the SPIRE Data Reduction Guide available through the HIPE help. This runs through the User Pipeline scripts step by step, describes several other Useful Scripts, and offers advice for specific types of sources:
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Cookbooks

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SPIRE Photometry cookbook.

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SPIRE photometry cookbook.

  The current version of the cookbook is available here and provides practical guidelines on how to do photometry with SPIRE. HELP The cookbook is not HIPE specific.
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SPIRE Calibration Tree Applicable Hipe Version Comment
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SPIRE_CAL_7_0 Hipe v7 Final v7 cal tree, currently used in operations.
SPIRE_CAL_6_1 Hipe v6 Final v6 cal tree
(SPIRE_CAL_6_0) Hipe v6 Spec major update
SPIRE_CAL_5_2 Hipe v5 Final v5 cal tree
(SPIRE_CAL_5_1) Hipe v5  
(SPIRE_CAL_5_0) Hipe v5 Phot flux conv. based on Neptune. Spec major update
SPIRE_CAL_4_0 Hipe v4 Spec point source flux conv based on Uranus
SPIRE_CAL_3_2 Hipe v3  
(SPIRE_CAL_3_1) Hipe v3  
(SPIRE_CAL_3_0) Hipe v3  
SPIRE_CAL_2_1 Hipe v2 Spec point source flux conv based on Vesta
(SPIRE_CAL_2_0) Hipe v2  
SPIRE_CAL_1_2 Hipe v1 Phot flux conv based on Ceres
(SPIRE_CAL_1_1) Hipe v1 Pre-launch dummy values
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SPIRE_CAL_7_0 HIPE v7 Final v7 cal tree, currently used in operations.
SPIRE_CAL_6_1 HIPE v6 Final v6 cal tree
(SPIRE_CAL_6_0) HIPE v6 Spec major update
SPIRE_CAL_5_2 HIPE v5 Final v5 cal tree
(SPIRE_CAL_5_1) HIPE v5  
(SPIRE_CAL_5_0) HIPE v5 Phot flux conv. based on Neptune. Spec major update
SPIRE_CAL_4_0 HIPE v4 Spec point source flux conv based on Uranus
SPIRE_CAL_3_2 HIPE v3  
(SPIRE_CAL_3_1) HIPE v3  
(SPIRE_CAL_3_0) HIPE v3  
SPIRE_CAL_2_1 HIPE v2 Spec point source flux conv based on Vesta
(SPIRE_CAL_2_0) HIPE v2  
SPIRE_CAL_1_2 HIPE v1 Phot flux conv based on Ceres
(SPIRE_CAL_1_1) HIPE v1 Pre-launch dummy values
  More details of the changes in each version are given here. Any of the calibration trees can be retrieved in HIPE from the HSA using (e.g.) cal = spireCal(calTree="spire_cal_7_0") etc. The default (applicable to the Hipe version) can be obtained with cal = spireCal(calTree="spire_cal")
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SPIRE calibration and performance

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Photometer

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Photometer calibration

 
  • SPIRE Photometer Beams: The theoretical and the observed SPIRE photometer beams are available from here . Please read the release note for more details. These are also available in the SPIRE calibration context and can be accessed in HIPE after a calibration context has been loaded (See above):
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  • Neptune and Uranus models used for the SPIRE flux calibration: the ESA2 models currently used in the SPIRE calibration are available here.
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FTS Spectrometer

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Spectrometer calibration

  Important FTS information, including calibration, point source and extended source calibration etc, is available in the SPIRE Observers' Manual, Sections 4.2 and 5.3. These two sections are a must-read for anybody processing SPIRE FTS data.
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Interest Groups and Scripts

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Interest groups and scripts

 
  • The following interest groups relate to processing of observations taken with SPIRE. The links provided allow subscription to these interest groups.
    • subscribe to the SPIRE Photometer interest group
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    • subscribe to the PACS, SPIRE and HIFI spectral maps interest group
  • User contributed scripts: Users are welcome to submit scripts and software that they believe could be of general interest to the community to the Herschel Helpdesk.
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Further Information

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Further information

 
 
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