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Melandri, A, Covino, S, Zaninoni, E, Campana, S, Bolmer, J, Cobb, BE, Gorosabel, J, Kim, JW, Kuin, P, Kuroda, D, Malesani, D, Mundell, CG, Nappo, F, Sbarufatti, B, Smith, RJ, Steele, IA, Topinka, M, Trotter, AS, Virgili, FJ, Bernardini, MG , D'Avanzo, P, D'Elia, V, Fugazza, D, Ghirlanda, G, Gomboc, A, Greiner, J, Guidorzi, C, Haislip, JB, Hanayama, H, Hanlon, L, Im, M, Ivarsen, KM, Japelj, J, Jelínek, M, Kawai, N, Kobayashi, S, Kopac, D, Lacluyzé, AP, Martin-Carrillo, A, Murphy, D, Reichart, DE, Salvaterra, R, Salafia, OS, Tagliaferri, G and Vergani, SD (2017) Colour variations in the GRB 120327A afterglow. Astronomy and Astrophysics, 607. ISSN 0004-6361
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Abstract
Aims. We present a comprehensive temporal and spectral analysis of the long Swift GRB 120327A afterglow data to investigate possible causes of the observed early-time colour variations. Methods. We collected data from various instruments and telescopes in X-ray, ultraviolet, optical, and near-infrared bands, and determined the shapes of the afterglow early-time light curves. We studied the overall temporal behaviour and the spectral energy distributions from early to late times. Results. The ultraviolet, optical, and near-infrared light curves can be modelled with a single power-law component between 200 and 2 × 10 4 s after the burst event. The X-ray light curve shows a canonical steep-shallow-steep behaviour that is typical of long gamma-ray bursts. At early times a colour variation is observed in the ultraviolet/optical bands, while at very late times a hint of a re-brightening is visible. The observed early-time colour change can be explained as a variation in the intrinsic optical spectral index, rather than an evolution of the optical extinction. © 2017 ESO.
| Item Type: | Article |
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| Uncontrolled Keywords: | 0201 Astronomical And Space Sciences |
| Subjects: | Q Science > QB Astronomy Q Science > QC Physics |
| Divisions: | Astrophysics Research Institute |
| Publisher: | EDP Sciences |
| Date Deposited: | 20 Nov 2017 13:08 |
| Last Modified: | 04 Sep 2021 10:59 |
| DOI or ID number: | 10.1051/0004-6361/201731759 |
| URI: | https://researchonline.ljmu.ac.uk/id/eprint/7568 |
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