  Early measurements of SN 1987A can be interpreted in light of a beam/jet
(BJ), with a collimation factor >10,000, which impacted polar ejecta (PE) to
produce the "Mystery Spot" (MS), ~24 lt-d away. Other details of SN 1987A
suggest that it came from a merger of 2 stellar cores of a common envelope (CE)
binary, i.e. a "double degenerate" (DD) SN. Even having to penetrate the CE,
the BJ may have caused a long-soft (l)GRB upon hitting the PE, thus DD can
produce lGRBs. Because DD must be the dominant merger/SN mechanism in
elliptical galaxies (EGs), where only short, hard GRBs (sGRBs) have been
observed, DD without CE or PE must also produce sGRBs, and thus NS-NS mergers
may not make GRBs as we know them, and/or be as common as previously thought.
Millisecond pulsars (MSPs) in the non-core-collapsed globular clusters are also
99% DD-formed from WD-WD merger, consistent with their 2.10 ms minimum spin
period, the 2.14 ms signal seen from SN 1987A, and sGRBs offset from the
centers of EGs. The details of Ia's suggest that these are also DD, and the
total thermonuclear disruption paradigm is now in serious doubt as well, a
cause for concern in Ia Cosmology, because Ia's will appear to be Ic's when
viewed from their DD merger poles, given sufficient matter above that lost to
core-collapse. As a DD SN, 1987A appears to be the Rosetta Stone for 99% of
SNe, GRBs and MSPs, including all recent nearby SNe except SN 1986J, and the
more distant SN 2006gy. There is no need to invent exotica, such as
"collapsars," to account for GRBs.
