Supernova Relic Neutrino Search at Super-Kamiokande
  A new Super-Kamiokande (SK) search for Supernova Relic Neutrinos (SRNs) was conducted using 2853 live days of data. Sensitivity is now greatly improved compared to the 2003 SK result, which placed a flux limit near many theoretical predictions. This more detailed analysis includes a variety of improvements such as increased efficiency, a lower energy threshold, and an expanded data set. New combined upper limits on SRN flux are between 2.8 and 3.0 nu_e cm^-2 s^-1 > 16 MeV total positron energy (17.3 MeV E_nu). 
The Super-Kamiokande Collaboration: K. Bays, T. Iida, K. Abe, Y.   Hayato, K. Iyogi, J. Kameda, Y. Koshio, L. Marti, M. Miur...
hep-ex