**Table 1:** GRB samples of known durations (T₉₀), redshifts (z) and/or peak energies ( $E_{\rm p}$ ).
Sample	No.	Class	Parameters	Ref.
$\rm s1^{\dag }$	75	LGRBs	T₉₀; z	1; 1; -
$\rm s2^{\dag }$	20	SGRBs	T₉₀; z	1; 1; -
$\rm s3^{\dag }$	44	LGRBs	T₉₀; z; $E_{\rm p}$	1; 1; 4
$\rm s4^{\dag }$	11	SGRBs	T₉₀; z; $E_{\rm p}$	1; 1; 4
$\rm s5^{\ddag }$	48	LGRBs	T₉₀; z	2, 3; 5; -
$\rm s6^{\sharp}$	18	LGRBs	T₉₀; z	2, 3; 5;-

Note: the references are given in order for T₉₀, zand $E_{\rm p}$ . Data sets: $^{\dag }$ Swift; $^{\ddag }$ pre-Swift; $^{\sharp}$ BATSE. Of the 20 SGRBs, GRB 050709, is adopted from HETE-2. Reference: 1. Swift public webpage; 2. Ghirlanda, Ghisellini & Lazzati (2004); 3. GRBlog website; 4. Butler et al. (2007); 5. Friedman & Bloom (2005).

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