I have created a GUI editor for creating and modifying source model xml files for use by Likelihood. It is available from the likeGui package and is implemented in Python. This is a brief tutorial of its use.
- We begin by extracting the 3EG sources within a specified acceptance cone on the sky:\\\\
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A dialog window pops up in which we specify the acceptance cone parameters, source catalog and output file name.\\\\
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The acceptance cone we choose has angular radius 20 degrees and is centered on the Galactic anticenter. The source catalogs that this application is able to read are in the format used by the flux package. The default is the version of the 3EG catalog that was prepared for DC1. The flux limit is in the same units of flux used in the xml file. For point sources used by the flux package, flux values are in units of photons m -2 s -1 \\\\ - A list of the extracted sources appears in the list box on the left. Selection of a source in this list box cause the source model components and parameter values to be displayed in the list boxes on the right. \\\\
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If desired, one can change the name of the source by editing its name in entry box on the upper right side:\\\\
\\\\ - Model components for the spectral and spatial parts of the source can be changed via the pull-down menues associated with each component. Here we choose a broken power-law for modeling the Crab.\\\\
\\\\ - To edit any parameter value, just double-left-click on that parameter in the list box and a dialog window will pop-up giving access to all of the attributes associated with that parameter.\\\\
