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The 2175 Å Extinction Feature in the Optical Afterglow Spectrum of GRB 180325A at z = 2.25

  • Authors: T. Zafar, K. E. Heintz, J. P. U. Fynbo, D. Malesani, J. Bolmer, C. Ledoux, M. Arabsalmani, L. Kaper, S. Campana, R. L. C. Starling, J. Selsing, D. A. Kann, A. de Ugarte Postigo, T. Schweyer, L. Christensen, P. Møller, J. Japelj, D. Perley, N. R. Tanvir, P. D'Avanzo, D. H. Hartmann, J. Hjorth, S. Covino, B. Sbarufatti, P. Jakobsson, L. Izzo, R. Salvaterra, V. D'Elia, and D. Xu

2018 The Astrophysical Journal Letters 860 L21.

  • Provider: AAS Journals

Caption: Figure 1.

Optical afterglow spectra of GRB 180325A (in the extinction bump region) at four epochs observed with the NOT/AlFOSC and VLT/X-shooter instruments. Each color corresponds to a different epoch and mid-times of observations are indicated in the corresponding color. Inset: shown is the VLT/X-shooter spectrum and corresponding noise spectrum (blue dotted line) in the Lyα absorption-line region. The red solid and dashed lines show the best-fit H I column density profile and 1σ error, respectively.

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