Separating gamma-ray signals from background

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Hi all, I am working with some data which is a combination of gamma ray signals and some other gamma ray background. Someone told me that I can use Poisson distribution to separate the data from the background but I am not sure how. Does anyone know how to use Poisson or any other viable method?
 
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How does your data distribution look like?
 
ChrisVer said:
How does your data distribution look like?
It is a light curve. Kinda like this
 
majormuss said:
It is a light curve. Kinda like this
upload_2015-7-19_1-49-5.png
 
I am not sure then that you can use the Poisson distribution.
What you could use instead is some way to find background data or extract them from your program...so that you can subtract them from your curve.
 

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