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The properties of the 2175AA extinction feature discovered in GRB afterglows by Zafar, Tayyaba; Watson, Darach; Eliasdottir, Ardis; Fynbo, Johan P. U.; Kruhler, Thomas; Schady, Patricia; Leloudas, Giorgos; Jakobsson, Pall; Thone, Christina C.; Perley, Daniel A.; Morgan, Adam N.; Bloom, Joshua; Greiner, Jochen is a scholarly article available to read on EtoBox.

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The unequivocal, spectroscopic detection of the 2175 bump in extinction curves outside the Local Group is rare. To date, the properties of the bump have been examined in only two GRB afterglows (GRB 070802 and GRB 080607). In this work we analyse in detail the detections of the 2175 extinction bump in the optical spectra of the two further GRB afterglows: GRB 080605 and 080805. We gather all available optical/NIR photometric, spectroscopic and X-ray data to construct multi-epoch SEDs for both GRB afterglows. We fit the SEDs with the Fitzpatrick & Massa (1990) model with a single or broken PL. We also fit a sample of 38 GRB afterglows, known to prefer a SMC-type extinction curve, with the same model. We find that the SEDs of GRB 080605 and GRB 080805 at two epochs are fit well with a single PL with a derived extinction of A_V = 0.52(+0.13 -0.16) and 0.50 (+0.13 -0.10), and 2.1(+0.7-0.6) and 1.5+/-0.2 respectively. While the slope of the extinction curve of GRB 080805 is not well-constrained, the extinction curve of GRB 080605 has an unusual very steep far-UV rise together with the 2175 bump. Such an extinction curve has previously been found in only a small handful of sightlines in

Author

Zafar, Tayyaba; Watson, Darach; Eliasdottir, Ardis; Fynbo, Johan P. U.; Kruhler, Thomas; Schady, Patricia; Leloudas, Giorgos; Jakobsson, Pall; Thone, Christina C.; Perley, Daniel A.; Morgan, Adam N.; Bloom, Joshua; Greiner, Jochen

Published

2012

Language

EN