SN1987A: Revisiting the Data and the Correlation between Neutrino and Gravitational Detectors

TL;DR

This paper re-analyzes SN1987A data, revealing additional neutrino bursts and significant correlations between gravitational wave and neutrino detectors, suggesting a longer supernova collapse duration and potential detector correlations.

Contribution

It provides new insights into the supernova's neutrino emission timeline and revisits correlations between gravitational wave and neutrino detectors, challenging previous assumptions.

Findings

Identification of a second neutrino burst at 7:54 hours UT.

Evidence of longer supernova collapse duration than previously thought.

Significant correlations between gravitational wave and neutrino detectors centered around LSD detection time.

Abstract

We re-examine the data taken by the neutrino detectors during the supernova SN1987A. It is found that the Kamiokande data, in addition to the well known burst at 7:35 hours UT, show another one at 7:54 hours, with seven pulses in 6.2 seconds. This second burst supports the idea that the duration of the collapse was much longer than a few seconds, as already suggested by the LSD detection at 2:56 hours the same day, i.e. four and a half hours earlier. The correlations between the gravitational wave detectors (Rome and Maryland) and the neutrino detectors are also revisited. It is shown that the g.w. detectors exhibit significant correlations with both the LSD and the Kamiokande detectors over periods of one-two hours that are centered, in both cases, at the LSD time.