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We discuss a scenario of short Gamma-Ray Bursts (GRBs) following a merger ofa massive ONeMg white dwarf (WD) with a CO WD, and an ensuing accretion inducedcollapse (AIC). An initial system with the primary mass $M_1 \sim 6-10 \,M_\odot$ and the secondary mass $M_2 \sim 3-6\, M_\odot$ forms, via twodistinct evolutionary channels, a double degenerate CO-ONeMg WD system. Forsufficiently large mass ratio $q \equiv M_2/M_1 > q_{crit} \sim 0.25$ theensuing gravitational wave-driven mass transfer is unstable, whereby the lessmassive CO WD is disrupted and transfers its mass to the primary ONeMg WD on afew orbital time scales. The merger product ignites shell CO burning, addingmass to the degenerate core; at the same time mass and angular momentum is lostdue to powerful winds. For an ONeMg WD sufficiently close to the Chandrasekharmass an electron-capture accretion induced collapse (AIC) follows $\sim 10^4$years afterwards. We associate the prompt short GRB emission with a directcollapse of an ONeMg WD to a neutron star, without formation of an accretiondisk. After the collapse the accretion of the unburnt part of the shell ontothe newly formed NS powers the extended emission (EE). During the collapse theneutron star is spun to millisecond periods and produce long lastingrelativistic winds that shock against the material lost during theshell-burning stage, and produce afterglow emission from the wind terminationshock.

Short Gamma-Ray Bursts following mergers of an ONeMg with a CO white dwarf