GRB environment properties through X and optical afterglow observations

Conciatore, M. L. and Antonelli, L. A. and Stratta, G. and Fiore, F. and Perna, R. (2005) GRB environment properties through X and optical afterglow observations. Il nuovo cimento C, 28 (4\5). pp. 487-491. ISSN 1826-9885

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We present the spectral analysis of 14 gamma-ray bursts (GRB) X-ray afterglows in order to investigate the properties of interstellar matter (ISM) along thelineof sight of GRB. Wecarrie d out a simultaneous analysis of theNIRoptical and X-band for those afterglows with an optical counterpart too, in order to evaluate and strongly constrain the absorption effect on the spectral energy distribution due to dust extinction from GRB environment. We evaluated the equivalent hydrogen column density NH from X-ray spectroscopy and rest frame visual extinction AV by assuming different type of ISM composition and dust grain size distribution. From our analysis we obtained a distribution of the GRB rest frame consistent with the one expected if GRB were embedded in a galactic-like molecular cloud. Moreover, values of the visual extinction estimated from the simultaneous analysis of NIR-to-X band favour an environment where small dust grains are destroyed by thein teraction with theX-ra y and UV photons from GRB.

Item Type: Article
Additional Information: Paper presented at the “4th Workshop on Gamma-Ray Burst in the Afterglow Era”, Rome, October 18-22, 2004.
Uncontrolled Keywords: γ-ray sources; γ-ray bursts ; Interstellar dust grains; diffuse emission; infrared cirrus
Subjects: 500 Scienze naturali e Matematica > 520 Astronomia e scienze connesse
Depositing User: Marina Spanti
Date Deposited: 16 Mar 2020 16:45
Last Modified: 16 Mar 2020 16:45

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