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Gamma-ray bursts (GRBs) are among the most powerful events observed in ouruniverse and have long been considered as possible sources of ultra-high-energycosmic rays, which makes them promising neutrino source candidates. PreviousIceCube searches for neutrino correlations with GRBs focused on the prompt(main emission) phase of the GRB and found no significant correlation betweenneutrino events and the observed GRBs. This motivates us to extend our searchbeyond the prompt phase. We perform analyses looking for evidence of neutrinoemission up to 14 days before and after the prompt phase of GRBs. Theseanalyses rely on a sample of candidate muon-neutrino events observed by IceCubefrom May 2011 to October 2018. The analyses are model-independent. Two of themscan different time-windows for possible neutrino emission, while a thirdanalysis targets precursor emission based on GRB precursor observations byFermi-GBM. We discuss the results and implications of these searches includinglimits on the contribution of GRBs to the diffuse neutrino flux.

Searches for Neutrinos from Precursors and Afterglows of Gamma-ray Bursts using the IceCube Neutrino Observatory