Colour variations in the GRB 120327A afterglow
- Melandri, A.
- Covino, S.
- Zaninoni, E.
- Campana, S.
- Bolmer, J.
- Cobb, B.E.
- Gorosabel, J.
- Kim, J.-W.
- Kuin, P.
- Kuroda, D.
- Malesani, D.
- Mundell, C.G.
- Nappo, F.
- Sbarufatti, B.
- Smith, R.J.
- Steele, I.A.
- Topinka, M.
- Trotter, A.S.
- Virgili, F.J.
- Bernardini, M.G.
- d'Avanzo, P.
- d'Elia, V.
- Fugazza, D.
- Ghirlanda, G.
- Gomboc, A.
- Greiner, J.
- Guidorzi, C.
- Haislip, J.B.
- Hanayama, H.
- Hanlon, L.
- Im, M.
- Ivarsen, K.M.
- Japelj, J.
- Jelínek, M.
- Kawai, N.
- Kobayashi, S.
- Kopac, D.
- Lacluyzé, A.P.
- Martin-Carrillo, A.
- Murphy, D.
- Reichart, D.E.
- Salvaterra, R.
- Salafia, O.S.
- Tagliaferri, G.
- Vergani, S.D.
DOIAbstract
International audienceAims. 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 × 104 s after the burst event. The X-ray light curve shows a canonical steep-shallow-steep behaviour that is typ...
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