Delayed GeV-TeV Photons from Gamma-Ray Bursts Producing High-Energy Cosmic Rays

摘要: A scenario in which cosmic rays (CRs) above 1020 eV are produced by cosmological gamma-ray bursts (GRBs) is consistent with observations, provided that deflections the intergalactic magnetic field (IGMF) delay and spread arrival time of CRs over ≥50 yr. The energy lost as they propagate interact microwave background transformed cascading into secondary GeV-TeV photons. We show a significant fraction these photons can arrive delays much smaller than CR if space occupied large-scale "voids," regions size 5 Mpc weaker 10-15 G. Such voids might be expected, for example, models where weak primordial amplified shocked, turbulent medium during formation structure. For strength ~4 × 10-11 G high-field regions, value required to account observed galactic fields IGMF were frozen protogalactic plasma, burst at distance 100 ~100 yr, fluence 10 GeV on hour-day timescales I(>E) ~ 10-6 E cm-2. This close detection threshold current high-energy experiments. Detection delayed flux would support GRB-CR association also provide information