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Browsing by Author "Kaper, L"

Browsing by Author "Kaper, L"

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    The 2175 Å Extinction Feature in the Optical Afterglow Spectrum of GRB 180325A at z = 2.25 
    Zafar, T.; Elm Heintz, Kasper; Fynbo, J. P. U.; Malesani, D.; Bolmer, J.; Ledoux, C.; Arabsalmani, M.; Kaper, L.; Campana, S.; Starling, R. L. C.; Selsing, J.; Kann, D. A.; Postigo, A. de Ugarte; Schweyer, T.; Christensen, L.; Møller, P.; Japelj, J.; Perley, D.; Tanvir, N. R.; D’Avanzo, P.; Hartmann, D. H.; Hjorth, J.; Covino, S.; Sbarufatti, B.; Jakobsson, P.; Izzo, L.; Salvaterra, R.; D’Elia, V.; Xu, D. (American Astronomical Society, 2018-06-18)
    The ultraviolet (UV) extinction feature at 2175 Å is ubiquitously observed in the Galaxy but is rarely detected at high redshifts. Here we report the spectroscopic detection of the 2175 Å bump on the sightline to the γ-ray burst (GRB) afterglow GRB ...
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    Highly ionized metals as probes of the circumburst gas in the natal regions of gamma-ray bursts 
    Elm Heintz, Kasper; Watson, D; Jakobsson, Pall; Fynbo, J P U; Bolmer, J; Arabsalmani, M; Cano, Zach; Covino, S; D’Elia, V; Gomboc, A; Japelj, J; Kaper, L; Krogager, J-K; Pugliese, G; Sánchez-Ramírez, R; Selsing, J; Sparre, M; Tanvir, N R; Thöne, C C; de Ugarte Postigo, A; Vergani, S D (Oxford University Press (OUP), 2018-06-04)
    We present here a survey of high-ionization absorption lines in the afterglow spectra of long-duration gamma-ray bursts (GRBs) obtained with the VLT/X-shooter spectrograph. Our main goal is to investigate the circumburst medium in the natal regions of ...