High energy neutrinos from choked GRBs and their flavor ratio measurement by the IceCube

Understand

The high energy neutrinos produced in a choked GRB can undergo matter oscillation before emerging out of the stellar envelope.

• Before reaching the detector on Earth, these neutrinos can undergo further vacuum oscillation and then Earth matter oscillation.
• In the context of IceCube we study the Earth matter effect on neutrino flux in the detector.
• For the calculation of track-to-shower ratio R in the IceCube, we have included the shadowing effect and the additional contribution from the muon track produced by the high energy tau lepton decay in the vicinity of the detector.