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We analyze the 1496 days of SuperKamiokande data to put limits on the nue,anti-nue, numu + nutau and anti-numu + anti-nutau components of the diffuseflux of supernova neutrinos, in different energy intervals and for differentneutrino energy spectra. By considering the presence of only one component at atime, we find the following bounds at 90% C.L. and for neutrino energy E>19.3$MeV: Phi_{nue}<73.3-154 cm^-2 s^-1, Phi_{anti-nue} <1.4-1.9 cm^-2 s^-1,Phi_{numu+nutau} <(1.0-1.4) 10^3 cm^-2 s^-1, and Phi_{anti-numu+ anti-nutau}<(1.3-1.8) 10^3 cm^-2 s^-1, where the intervals account for varying theneutrino spectrum. In the interval E = 22.9 - 36.9 MeV, we find Phi_{nue}<39-54cm^-2 s^-1, which improves on the existing limit from SNO in the same energywindow. Our results for numu + nutau and anti-numu + anti-nutau improve byabout four orders of magnitude over the previous best constraints from LSD.

Upper limits on the diffuse supernova neutrino flux from the SuperKamiokande data