I identified it by going on Twitter and searching for Somerville to see what was going on and finding this tweet with a timestamp that lines up with when I heard the loud helicopter: https://twitter.com/NVermaNBCBoston/status/824921260593405952
I don't know if there were any emergency services helicopters flying around last night in addition to this news helicopter, but if they were, they weren't the ones that woke me up.
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Date: 2017-01-27 05:46 pm (UTC)I don't know if there were any emergency services helicopters flying around last night in addition to this news helicopter, but if they were, they weren't the ones that woke me up.