Oh yes, it there with out bike running. I've replaced the exhaust gaskets already, that was a different noise.
I'd check the gas tank bolts as mentioned earlier. I'll bet the front gas tank tab is bouncing against the bolt or frame.
Check two front gas tank screws.
Never happened to me, but read somewhere somebody was chasing a rattle and that's what it turned out to be and easy enough to check.
Also look over exhaust pipes and heat shields carefully. May not be something loose, maybe rubbing..??
Good luck.