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Colour variations in the GRB 120327A afterglow

Melandri, A and Covino, S and Zaninoni, E and Campana, S and Bolmer, J and Cobb, BE and Gorosabel, J and Kim, JW and Kuin, P and Kuroda, D and Malesani, D and Mundell, CG and Nappo, F and Sbarufatti, B and Smith, RJ and Steele, IA and Topinka, M and Trotter, AS and Virgili, FJ and Bernardini, MG and D'Avanzo, P and D'Elia, V and Fugazza, D and Ghirlanda, G and Gomboc, A and Greiner, J and Guidorzi, C and Haislip, JB and Hanayama, H and Hanlon, L and Im, M and Ivarsen, KM and Japelj, J and Jelínek, M and Kawai, N and Kobayashi, S and Kopac, D and Lacluyzé, AP and Martin-Carrillo, A and Murphy, D and Reichart, DE and Salvaterra, R and Salafia, OS and Tagliaferri, G and Vergani, SD (2017) Colour variations in the GRB 120327A afterglow. Astronomy and Astrophysics, 607. ISSN 0004-6361

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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
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: 20 Nov 2017 13:08
DOI or Identification number: 10.1051/0004-6361/201731759
URI: http://researchonline.ljmu.ac.uk/id/eprint/7568

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