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Troja, E; Cusumano, G; O’Brien, P. T; Zhang, B; Sbarufatti, B; Mangano, V; Willingale, R; Chincarini, G; Osborne, J. P; Marshall, F. E; Burrows, D. N; Campana, S; Gehrels, N; Guidorzi, C; Krimm, H. A; La Parola, V; Liang, E. W; Mineo, T; Moretti, A; Page, K. L; Romano, P; Tagliaferri, G; Zhang, B. B; Page, M. J; Schady, P
The Astrophysical journal, 08/2007, Volume: 665, Issue: 1Journal Article
We present a detailed analysis of Swift multiwavelength observations of GRB 070110 and its remarkable afterglow. The early X-ray light curve, interpreted as the tail of the prompt emission, displays a spectral evolution already seen in other gamma-ray bursts. The optical afterglow shows a shallow decay up to similar to 2 days after the burst, which is not consistent with standard afterglow models. The most intriguing feature is a very steep decay in the X-ray flux at similar to 2 x 10 super(-1) s after the burst, ending an apparent plateau. The abrupt drop of the X-ray light curve rules out an external shock as the origin of the plateau in this burst and implies long-lasting activity of the central engine. The temporal and spectral properties of the plateau phase point toward a continuous central engine emission rather than the episodic emission of X-ray flares. We suggest that the observed X-ray plateau is powered by a spinning-down central engine, possibly a millisecond pulsar, which dissipates energy at an internal radius before depositing energy into the external shock.
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