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Here we consider faster-than-light neutrinos having $m_\nu^2=-0.38$ $keV^2$as the explanation of the Mont Blanc burst. It is shown that the Mont Blancburst is consistent with the distinctive signature of that explanation i.e., an8 MeV antineutrino line from SN 1987A. It is further shown that a model of corecollapse supernovae involving dark matter particles of mass 8 MeV would in factyield an 8 MeV antineutrino line. Moreover, that dark matter model predicts 8MeV $\nu,\bar{\nu}$ and $e^+e^-$ pairs from the galactic center, a place whereone would expect large amounts of dark matter to collect. The resulting $e^+$would create $\gamma-$rays from the galactic center, and a fit to MeV$\gamma-$ray data yields the model's dark matter mass, as well as thecalculated source temperature and angular size. More direct support comes fromthe spectrum of $N\sim1000$ events recorded by the Kamiokande-II detector onthe day of SN 1987A, which appear to show an 8 MeV line atop the detectorbackground. This $\bar{\nu}$ line, if genuine, has been well-hidden for 30years because it occurs very close to the peak of the background. This factmight ordinarily justify extreme skepticism. In the present case, however, amore positive view is called for based on (a) the very high statisticalsignificance of the result $(30 \sigma),$ (b) the use of a detector backgroundindependent of the SN 1987A data using a later K-II data set, and (c) theobservation of an excess above the background spectrum whose central energy andwidth both agree with that of an 8 MeV $\bar{\nu}$ line broadened by $25\%$resolution. Lastly, it is noted that the tachyonic interpretation of the MontBlanc burst fits the author's earlier unconventional $3+3$ model of theneutrino mass states.

The Mont Blanc neutrinos from SN 1987A: Could they have been monochromatic (8 MeV) tachyons with $m^2=-0.38$ keV$^2$?