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It is noted that X-ray tails (XRTs) of short, hard $\gamma$-ray bursts (SHBs)are similar to X-ray flashes (XRFs). We suggest a universal central enginehypothesis, as a way of accounting for this curiosity, in which SHBs differfrom long $\gamma$-ray bursts (GRBs) in prompt emission because of thedifferences in the host star and attendant differences in the environment theypresent to the compact central engine (as opposed to differences in the centralengine itself). Observational constraints and implications are discussed,especially for confirming putative detections of gravitational waves frommerging compact objects.

A Universal Central Engine Hypothesis for Short and Long GRBs