The bird is probably the same individual that wintered at a garbage dump in eastern Norway during the winter 2008-2009. Then it got lots of attention, and became a national celebrity. It was named "Sture", and media all over the country published news about the bird that normally winters in Africa. It might well be a bird from the Swedish reintroduction programme. These birds tend to winter in or near Sweden.
"Sture" was rediscovered in southeastern Norway early March 2010, and stayed in southern Norway until the middle of November. "Sture" was (probably) not observed in 2011, but may still show up in 2012. So keep your eyes open these days. Genuine migrants wintering in Africa normally show up in Norway late April or early May. Below you can see a map where I have tried to plot the birds movements during its stay in 2010. Green marker indictes the first observation on 7 March (Nome in Telemark county), and the red marker indicate the last date, 17 November (Voss in Hordaland county).