Difference: SpireCalibrationWeb (60 vs. 61)

Revision 612012-07-25 - IvanV

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META TOPICPARENT name="WebHome"

SPIRE instrument and calibration web pages

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Reducing SPIRE data

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Info In order to obtain the best possible Level 2 SPIRE photometry or spectroscopy data, the observations might have to be reprocessed with the latest HIPE User Release.
 

Software and documentation

  • HIPE (Herschel Interactive Processing Environment): The latest User Release HCSS version that you should use for reducing SPIRE data is HIPE v9.0.0. 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 9.0 build 2974.
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  • 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.

Data processing known issues
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  • In order to obtain the best possible Level 2 SPIRE photometry data, the observations might have to be reprocessed with the latest HIPE User Release (see above).
 
  • Stripes in PSW, PMW and/or PLW (Level 2) maps
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    • All SPIRE photometry pipelines now use by default the destriper, which improves the issue of striping in level 2 maps. Hence observers should expect potential improvements in that respect with version 9.

 
  • De-glitcher masks faint sources
    • The de-glitcher is a very delicate process. In particular, for data taken in Parallel Mode (sampling at 10Hz) and at high speed (60"/s) the de-glitcher with standard parameters may flag very faint sources as glitches. Bright sources are different from glitches in that they have a Gaussian (i.e. beam/PSF) shape. For faint sources, the sampling rate could be not high enough and hence they have a "delta" shape, which is similar to a small glitch. The user might try to modify the correlation parameter to 0.95: this will decrease the number of detected glitches. In case of high scan rate and low sampling speed one may want to stay with a limited level 1 detection rate and defer to Level 2 deglitching.
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  A listing of the available Dark Sky observations can be found here.
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Info SPIRE FTS known data processing issues are given here.
 
<-- In order to obtain the teleRsrf calibration file derived for the OD of your observation and valid for your HIPE/calibration tree version, please raise a Helpdesk ticket (select the "SPIRE FTS" department) specifying the observation that you are trying to process. -->

 
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