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Answer: per-burst engine classification with energy budget, using X-ray plateaus, extended emission and late flares.","problem_ref":"80a9eb0c6f00c33e686d5766a1873762a0a09545469c2342649d3c3a08342879","references":"","settled_by":"Beaming-corrected jet energies above $2 \\times 10^{52}\\,\\mathrm{erg}$ excluding magnetars for a burst subclass, and gravitational-wave detection of the post-merger remnant for short bursts.","status_note":"","title":"Millisecond magnetar or accreting black hole as GRB 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