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_pphiref_2015.json that is used in the luminosity calculation.
The integrated luminosity for validated runs and luminosity sections of the 5.02TeV proton-proton collision data, needed as reference data for heavy-ion data analysis, taken in 2015 (Run2015E) is available in Run2015Elumi.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. For prescaled triggers, the change of prescales (run, lumi section, index of prescales referring to the PrescaleService module in the High-Level Trigger configuration files) is recorded in prescale_pphiref2015.csv.
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