Short gamma-ray burst progenitors have short delay times

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Volume 710 (June 2026)

A&A, 710 (2026) A267

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Table A.2.

Constraints on parameters for the W15 sample and model. Error bars depict 1σ posterior credible intervals as in W15 to make a direct comparison between the parameters inferred.

	W15 prior				Wider prior
Parameter	Power-law		Log-normal		Power-law	Log-normal

	This work	W15 (SFR2)	This work	W15 (SFR2)	This work
α_BPL	${0.89}_{- 0.23}^{+ 0.15}$ $Mathematical equation: $ {0.89}_{-0.23}^{+0.15} $$	$0 . 90_{- 0.17}^{+ 0.12}$ $Mathematical equation: $ 0.90^{+0.12}_{-0.17} $$	${0.99}_{- 0.12}^{+ 0.09}$ $Mathematical equation: $ {0.99}_{-0.12}^{+0.09} $$	$0 . 96_{- 0.12}^{+ 0.11}$ $Mathematical equation: $ 0.96^{+0.11}_{-0.12} $$	${- 1.63}_{- 0.92}^{+ 1.07}$ $Mathematical equation: $ {-1.63}_{-0.92}^{+1.07} $$	${0.69}_{- 2.70}^{+ 0.36}$ $Mathematical equation: $ {0.69}_{-2.70}^{+0.36} $$
β_BPL	${2.00}_{- 0.46}^{+ 1.00}$ $Mathematical equation: $ {2.00}_{-0.46}^{+1.00} $$	$2 . 10_{- 0.70}^{+ 1.10}$ $Mathematical equation: $ 2.10^{+1.10}_{-0.70} $$	${2.69}_{- 0.85}^{+ 1.55}$ $Mathematical equation: $ {2.69}_{-0.85}^{+1.55} $$	$1 . 90_{- 0.70}^{+ 1.00}$ $Mathematical equation: $ 1.90^{+1.00}_{-0.70} $$	${1.34}_{- 0.08}^{+ 0.10}$ $Mathematical equation: $ {1.34}_{-0.08}^{+0.10} $$	${1.43}_{- 0.19}^{+ 1.45}$ $Mathematical equation: $ {1.43}_{-0.19}^{+1.45} $$
log₁₀(L_*/erg s⁻¹)	${52.21}_{- 0.40}^{+ 0.55}$ $Mathematical equation: $ {52.21}_{-0.40}^{+0.55} $$	$52 . 30_{- 0.12}^{+ 0.24}$ $Mathematical equation: $ 52.30^{+0.24}_{-0.12} $$	${52.68}_{- 0.30}^{+ 0.22}$ $Mathematical equation: $ {52.68}_{-0.30}^{+0.22} $$	$52 . 30_{- 0.10}^{+ 0.23}$ $Mathematical equation: $ 52.30^{+0.23}_{-0.10} $$	${50.32}_{- 0.14}^{+ 0.14}$ $Mathematical equation: $ {50.32}_{-0.14}^{+0.14} $$	${1.43}_{- 0.19}^{+ 1.45}$ $Mathematical equation: $ {1.43}_{-0.19}^{+1.45} $$
α_t	${0.62}_{- 0.26}^{+ 0.28}$ $Mathematical equation: $ {0.62}_{-0.26}^{+0.28} $$	$0 . 71_{- 0.23}^{+ 0.21}$ $Mathematical equation: $ 0.71^{+0.21}_{-0.23} $$			${0.46}_{- 0.28}^{+ 0.34}$ $Mathematical equation: $ {0.46}_{-0.28}^{+0.34} $$
μ_t/Gyr			${3.09}_{- 0.46}^{+ 0.46}$ $Mathematical equation: $ {3.09}_{-0.46}^{+0.46} $$	$3 . 90_{- 0.50}^{+ 0.40}$ $Mathematical equation: $ 3.90^{+0.40}_{-0.50} $$		${3.02}_{- 0.68}^{+ 0.53}$ $Mathematical equation: $ {3.02}_{-0.68}^{+0.53} $$
σ_t			${0.04}_{- 0.03}^{+ 0.12}$ $Mathematical equation: $ {0.04}_{-0.03}^{+0.12} $$	0.00^+0.02		${0.07}_{- 0.06}^{+ 0.45}$ $Mathematical equation: $ {0.07}_{-0.06}^{+0.45} $$
R₀/Gpc⁻³ yr⁻¹	${13.18}_{- 5.42}^{+ 7.23}$ $Mathematical equation: $ {13.18}_{-5.42}^{+7.23} $$	$7 . 7_{- 4.6}^{+ 5.4}$ $Mathematical equation: $ 7.7_{-4.6}^{+5.4} $$	${7.94}_{- 2.70}^{+ 3.28}$ $Mathematical equation: $ {7.94}_{-2.70}^{+3.28} $$	$3 . 6_{- 1.4}^{+ 1.6}$ $Mathematical equation: $ 3.6_{-1.4}^{+1.6} $$	${16.98}_{- 5.23}^{+ 6.46}$ $Mathematical equation: $ {16.98}_{-5.23}^{+6.46} $$	${8.51}_{- 3.02}^{+ 3.79}$ $Mathematical equation: $ {8.51}_{-3.02}^{+3.79} $$

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