Using the fading X-ray rings of GRB 221009A, the authors infer the complex refractive index and grain size distribution of Milky Way dust, finding a maximum grain radius of 0.24 micrometers and an iron mass fraction of 35%.
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The optical constants and grain sizes of interstellar dust measured directly using the dust scattered x-ray halo of GRB 221009A
Using the fading X-ray rings of GRB 221009A, the authors infer the complex refractive index and grain size distribution of Milky Way dust, finding a maximum grain radius of 0.24 micrometers and an iron mass fraction of 35%.