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25-December-2001, 10:42 AM
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http://www.space.com/scienceastronom...st_011221.html
This article says the strong bursts are far away and the weak ones are nearby. Maybe the strong bursts ionize more gas from the source and therefore produce a bigger intrinsic redshift from the Compton effect, making them appear to be farther away as though the red shift weren't intrinsic. The bigger redshift makes them seem farther as if they are following Hubble's law, but really they could be relatively nearby. 
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