Frequently asked Questions about GLAST Data Access

General questions

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  How do I download a single file from a Monte Carlo task?
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  How do I tell the skimmer which datasets to read?
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  Why does the dataCatalog say a particular file is empty (when it really isn't)?
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  How do I add a FAQ to this list?
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  I want to analyze some data from a specific Monte Carlo task, how do I do that?
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  What are "Key Locations" in the data catalog
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  How do I extract selected real data for use with WIRED and FRED?
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  How do I easily add multiple ROOT files stored in xrootd to a TChain?
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  Manually extracting a task's data from xroot

Astro Server FAQ

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  What data are available from the Astro Server?
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  What expert options are available for the Astro Server?
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  How are astronomical objects looked up?
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  How should I report problems with the Astro Server?
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  Is there a command line interface to the astro server?

FITS Skimmer FAQ

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  What cuts can I make using the Fits Skimmer?
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  What expert options are available for the Fits Skimmer?
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  How do I specify Datacat Criteria?

Merit Skimmer FAQ

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  Is there documentation on the skimmer backend?
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  What expert options are available with the Merit Skimmer?
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  How do I specify a TCut?
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  How do I specify Datacat Criteria?

See Also

• Data Catalog Users Guide
• Pipeline Users Guide
• Pipeline FAQ
• Skimmer User's Guide