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The recent detections of bright optical/infrared kilonova signals followingtwo long-duration gamma-ray bursts (LGRBs), GRB 211211A and GRB 230307A, havesignificantly challenged the traditional classification of GRBs. Thesemerger-driven LGRBs may represent a distinct GRB population. Since traditionalGRB classification methods often struggle to distinguish merger-driven LGRBsfrom traditional merger-driven short-duration GRBs resulting from compactobject mergers and collapse-driven LGRBs produced by massive stars, this workaims to explore the shared properties in terms of hardness, energy, andduration among currently observed merger-driven LGRB events, therebyidentifying their observed differences from the traditional GRB population. Wecollect a sample of merger-driven LGRBs with known redshifts, includingobserved information on their main emission (ME) and whole emission (WE)phases. Treating ME and WE properties as two independent sets of information,we apply several GRB classification methodologies to explore their potentialshared properties. Using the phenomenologically defined Energy-Hardness (EH)parameter, we identify a probable universal linear correlation acrossmerger-driven LGRBs, regardless of whether their ME or WE phases areconsidered. We propose that such shared properties of merger-driven LGRBs areunlikely to arise from the low-redshift selection effect and they becomeparticularly intriguing when compared with the relatively weak correlations orlack of correlation observed in traditional merger-driven short-duration GRBs(with or without extended emissions) and collapse-driven LGRBs. Our newlyproposed correlation highlights the necessity for further investigation intothe observations of merger-driven LGRBs and the physical mechanisms underlyingthe empirical correlation.

Shared Properties of Merger-driven Long-duration Gamma-Ray Bursts