The IceCube collaboration has recently announced the discovery of ultra-high energy neutrino events. These neutrinos can be used to probe their production source, as well as leptonic mixing parameters. In this work, we have used the first IceCube dat
a to constrain the leptonic CP violating phase $delta_{cp}$. For this, we have analyzed the data in the form of flux ratios. We find that the fit to $delta_{cp}$ depends on the assumptions made on the production mechanism of these astrophyscial neutrinos. Consequently, we also use this data to impose constraints on the sources of the neutrinos.
