CHATHAM, Mass. — A shark researcher has attached an electronic tracking device to a great white shark off Chatham.The Cape Cod Times reported it was (http://bit.ly/1rQwY24 ) the first time this year that a great white has been tagged in coastal waters.The Atlantic White Shark Conservancy says Greg Skomal, a state scientist, was able to tag the 12-foot shark on Thursday as it moved quickly past a research vessel a few hundred yards offshore.