I am thinkin that you bottomed out, on low air - and the bead came loose on the tire, flopped around , just a few times, and maybe you heard it hit the body, when it finally split.Jaguars run P6000's, and you are not too heavy for the tire.
I would look at the DOT number , on the sidewall, and date the tire to see how old.I read an article in Road & Track sometime ago, that said a tire looses 90% of its flex after 2 years.I bet not the tire, but the age.When you hit the bump, it didn't flex = instant disaster. .02 Mark