[Maine-birds] Color banded Herring Gull

Today at Mill Creek Cove (next to Hannaford) in South Portland, I saw an immature Herring Gull with an orange band marked CYN on the lower left leg.  The lower right leg had a USGS metal band.  The bird wasn't close and my photo is barely, I mean BARELY, legible but the band was easily read through a scope.  

My eBird checklist with two photos of the gull is here: https://ebird.org/me/checklist/S107204731

Anyone know the back story on this bird--where and when banded and by whom?

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