The afterglow light curve of some gamma-ray bursts (GRBs) exhibits a sudden intensity jump about one hour after the prompt emission in the optical band. We model this feature through the late collision of two relativistic shells and investigate the corresponding high-energy neutrino emission, while contrasting our findings with the ones from the classic fireball model. We find that the total number of emitted neutrinos may increase by about an order of magnitude within a dynamical time when an optical jump occurs with respect to the standard afterglow scenario. By exploring the detection prospects with upcoming neutrino telescopes, we conclude that the detection of neutrinos with IceCube-Gen2 radio could enable us to explore and constrain the yet-to-be unveiled mechanism powering the optical jumps.
Based on arXiv:2112.07690 [astro-ph.HE] and in collaboration with Irene Tamborra, Damien Bégué, Tetyana Pitik and Jochen Greiner.