There seems to be a pair of black holes merging

But I found very different articles about this merger, especially the distance of the pair is very different.

http://www.sciencenews.org/view/generic/id/41430/title/These_cosmic_gluttons_may_be_tight
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Moreover, the duo might be separated by only one-third of a light-year — less than 10 percent of the distance between the sun and its nearest star system, Alpha Centauri.
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http://www.livescience.com/space/090304-binary-black-holes.html
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The black holes appear to be separated by a mere 0.1 parsec, 13 times the distance between our sun and its nearest neighbor, Alpha Centauri.
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[[Yes, 1 parsec is ~3 light years, so the sentence above is totally wrong, they maybe mean that 13 times the distance of those black holes is the distance from our sun to Alpha Centauri]]

I first found a similar difference in german articles
http://www.wissenschaft.de/wissenschaft/news/301198.html
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Die beiden Objekte sind nur noch etwas über drei Lichtjahre von einander entfernt ...
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[[.. about 3 light years ...]]

http://www.spiegel.de/wissenschaft/weltall/0,1518,611394,00.html
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Sie sind nur noch ein Drittel eines Lichtjahres voneinander entfernt und stürzen aufeinander zu:
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[[.. about a third of a light year ...]]

so I thought it is just an error in the translation, but since english articles show that difference as well, what is wrong here?