That is a bolt-on derailleur hanger. If you know your model and year you should be able to contact Norco and they will either have a replacement or give you the part number. You may be able to find a replacement at Wheels Manufacturing...

https://wheelsmfg.com/derailleur-hangers.html

After looking at this again...See if the allen head bolt at the top of the hanger needs to be tightened. It could be coming loose from use. If that in fact is the problem be sure to try a little blue lock-tite on the threads to ensure a tight fit.