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Whence neutrinos?

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Astrophysical gamma-ray burst sources are blindingly bright in gamma-rays, during the tens of seconds that they are on, and they also are expected to produce significant amounts of high energy neutrinos. A cubic kilometer detector built under the ice at the South Pole has been looking for these - and sees fewer than expected. Thus, theoreticians need to readjust their thinking on how these sources really work.