Neutrino Absorption: In the magnetic field of GRB In the Fireball Model
  TeV or Super TeV neutrinos are expected to originate at the Gamma ray burster (GRB) events in the universe. These neutrinos are expected to be produced from the photo-meson interaction of the protons in the GRB environment. In the usual picture, the protons in the GRB fireball undergo Fermi acceleration in the ambient magnetic field of the GRB to very high energy. These protons then interact with the MeV, KeV or meV photons and produce Delta particles, those subsequently decay to produce very high energy neutrinos. In this note we focus on the 100 TeV neutrinos produced in a GRB in the fireball model. We try to estimate the production point of these multi TeV neutrinos from the center. The strength of the Magnetic field there. Lastly but importantly modification in the spectrum because of neutrino absorption in the ambient magnetic field. The strength of the ambient magnetic field may change the neutrino spectrum. 
A. K. Ganguly