CMS measures the luminosity using different luminometers (luminosity detectors) and algorithms. The luminometer giving the best value for each luminosity section is recorded in a 'normtag' file normtag_PHYSICS_2015.json that is used in the luminosity calculation.
The integrated luminosity for validated runs and luminosity sections of the 2015 public data (Run2015D) is available in Run2015Dlumi.txt. (The integrated luminosity for validated runs and luminosity sections of all 2015 p-p data taking is available in 2015lumi.txt.)
In your estimate for the integrated luminosity, check for which runs the trigger you have selected is active and sum the values for those runs. If you are using prescaled triggers, you can find the trigger prescale factors as shown in TriggerAnalyzer.cc of the PhysObjectExtractorTool example code. The change of prescales (run, lumi section, index of prescales) is recorded in prescale2015.csv
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