The IceCube detector at the South Pole picked up an extremely energetic neutrino last September. What was lucky about this detection, and why?

This has been answered by , thank you for taking part in the trivia and mentioning the rare interaction of neutrinos (they're such a fascinating particle)!

Answers I was accepting included the fact that the active galactic nucleus/black hole this was from has its jets pointed towards us (making this a blazar), other neutrinos and photons having been detected from a similar patch of sky making this a multi-messenger event and giving us the chance to triangulate on the location of its source better, and the face that neutrinos as an incredibly light/not very massive particle don't interact with baryonic matter often anyway and thus catching the particle in the detector was lucky.