Big Bird gets Energy

In a previous post, I wrote about our most energetic neutrino, Big Bird, but could not give you its energy.  I am happy to report that the energy has now been made public: 2.0 PeV, within about 12% (assuming that it is an electromagnetic cascade).  This is the most energetic neutrino yet seen.  For comparison, the energy of each proton circulating in the LHC beams at full energy (which will not be achieved until later this year) is about 0.007 PeV, 285 times lower.