The optical constants and grain sizes of interstellar dust measured directly using the dust-scattered X-ray halo of GRB221009A

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Table 2

Best-fit grain properties and relative incident flux in various bands with 1σ uncertainties.

Grain properties and flux-ratio
a_max	0.24 ± 0.01	F_{0.5–0.7 keV}	0.09 ± 0.02
a_min	<0.022	F_{0.7–1 keV}	0.34 ± 0.02
q	3.08 ± 0.04	F_{1.25–1.5 keV}	1.48 ± 0.04
		F_{1.5–1.75 keV}	1.48 ± 0.06
1 − n_{1 keV}	0.0009 ± 0.0002	F_{1.75–2 keV}	1.14 ± 0.06
k_{1 keV}	0.00027 ± 0.00007	F_{2–2.5 keV}	0.91 ± 0.05
k_α	3.4 ± 0.2	F_{2.5–3 keV}	0.63 ± 0.05
n_α	2.2 ± 0.2	F_{3–4 keV}	0.48 ± 0.04

Notes. The minimum grain size is provided with a 2σ upper limit. The flux ratio is reported relative to the flux at the 1–1.25 keV band, and the subscript denotes the lower-energy limit of the band.

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