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The Type II gamma-ray burst (GRB) 200826A challenges collapsar models byquestioning how they can generate a genuinely short-duration event. The otherType I GRB 211211A confused us with a kilonova signature observed in theafterglow of a \textit{long} burst. Here, we propose a comprehensive model inwhich both bursts are the results of the collapse of Thorne-\.Zytkow-likeObjects (TZlOs). The TZlO consists of a central neutron star (NS), with a densewhite dwarf (WD) material envelope, which is formed as the aftermath of a WD-NScoalescence. We find that the characteristics of the resultant GRBs depend onwhether the TZlO collapses immediately following the WD-NS merger or not.Additionally, the observational properties of the consequent GRBs manifestvariations contingent upon whether the collapse of the TZlO results in amagnetar or a black hole. We also show that our model is consistent with theobservations of GRB 211211A and GRB 200826A. Specifically, the optical excessin GRB 211211A can be attributed to an engine-fed kilonova, while the\textit{supernova bump} in GRB 200826A is likely due to the collision betweenthe ejecta and the disk wind shell.

GRBs from Collapse of Thorne-\.Zytkow-like Objects as the Aftermath of WD-NS Coalescence