Fabrizio FioreEmail: fabrizio.fiore@inaf.itAffiliation: INAF – Osservatorio Astronomico di TriesteLines of researchGamma-Ray Bursts as multimessenger and fundamental physics probesEarly Universe and the Epoch of ReionizationGamma-Ray Bursts as multi-messenger and fundamental physics probes From the First Stars to the Epoch of Reionization