A Nearby Bright X-ray Source

In the example above, it is assumed that the field around the source contains sky only. Provided a bright background source is well-separated from the target in the cross-dispersion direction, a mask can be created that excludes it from the background region. Here the source has been identified in the EPIC images and its coordinates have been taken from the EPIC source list which is included among the pipeline products. The bright neighboring object is found to be the third source listed in the sources file. The first source is the target.

To exclude a nearby source from the background region:

1)

Double-click on the task rgsproc and confirm you are in the correct working directory. Next to ``add sources from an epic-derived source list'' click ``yes''. Immediately below, next to ``name of the epic- derived source list'', enter the name of the EPIC source list (as produced by such tasks as emldetect and eboxdetect). Next to ``select which sources to exclude from the background'', enter INDEX==1&&INDEX==3.

2)

Click ``Run''.