Aartsen, M.Ackermann, M.Adams, J.Aguilar, J.Ahlers, M.Ahrens, M.Altmann, D.Anderson, T.Arguelles, C.Arlen, T.Auffenberg, J.Bai, X.Barwick, S.Baum, V.Bay, R.Beatty, J.Tjus, J.Becker, K.Benzvi, S.Berghaus, P.et al.2016-09-092016-09-092015Letters of the Astrophysical Journal, 2015; 805(1):L5-1-L5-72041-82052041-8213http://hdl.handle.net/2440/101062We present constraints derived from a search of four years of IceCube data for a prompt neutrino flux from gammaray bursts (GRBs). A single low-significance neutrino, compatible with the atmospheric neutrino background, was found in coincidence with one of the 506 observed bursts. Although GRBs have been proposed as candidate sources for ultra-high-energy cosmic rays, our limits on the neutrino flux disfavor much of the parameter space for the latest models. We also find that no more than ∼1% of the recently observed astrophysical neutrino flux consists of prompt emission from GRBs that are potentially observable by existing satellites.en© 2015. The American Astronomical Society. All rights reserved.gamma-ray burst ; general – neutrinosJournal article003003000310.1088/2041-8205/805/1/L50003547526000052-s2.0-84929631191166908