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I think Eta Carina is the next best possibility in our vicinity, it would be well documented if it went bang tomorrow!!!!, although SN can happen just about anywhere, your best bet would be to try routine galaxy (other than our own) SN search.
Trouble is, i wouldn't hold my breath waiting for any particular star to go off! Im not sure if there are candidates in the northern hemisphere, but in the south i think Eta Carina is the best known.
hope this helps!
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