The CSC is created by processing each Chandra dataset with a series of automated data analysis pipelines. Collectively, the pipelines are known as "Level 3 Processing" and the data products are named as such, e.g. the event file is evt3.fits. The nomenclature follows Chandra Standard Data Processing, which produces the Level 1 and 2 Chandra data products.
The calibrate pipeline is run for each OBI chosen by the observation selection process.
- Reprocess the datasets with the same CALDB
- Identify and remove background flares
- Create data products for use in the other pipelines
The detect pipeline is run for each calibrated OBI from the calibrate pipeline.
- Create high and low frequency background maps
- Detect source candidates with wavdetect
- Combine detections
- Calculate the source and background regions
- Calculate the limiting sensitivity
The source pipeline is run for each detection region created in the detect pipeline.
- Measure the source and PSF size; flag extended sources
- Create light curves and look for variability
- Perform spectral fitting to get flux
- Calculate additional source properties (e.g. position errors)
The master pipeline is run for each OBI which other OBIs overlap spatially to match sources identified in the source pipeline.
- Match sources from different OBIs
- Determine master source properties from the OBI entries
- Package the data for inclusion in the CSC