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I'd probably call it a dateline if it's describing time/date/location. If it's a subheader or describing anything about the content, it's a dek (that's the correct spelling, from journalism, withou...
Answer
#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/21425 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/21425 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/