Paper is published announcing the discovery of two PeV-energy neutrinos, indicating an astrophysical neutrino flux
In May 2012, the IceCube group at Chiba University in Japan discovered two PeV-energy neutrinos in the data from the past year. One, nicknamed “Bert,” had been detected in the IceCube array in August 2011; the other, “Ernie,” had been captured in January 2012. While not statistically significant enough to claim a first observation of astrophysical neutrinos (2.8 sigma), the two events were a first indication of an astrophysical neutrino flux. The results were published on July 8, 2013, in Physical Review Letters. Read more here and here.