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Swift observations of GRB 070110: an extraordinary X-ray afterglow powered by the central engine

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arxiv astro-ph/0702220 v2 pith:SZD5TSV6 submitted 2007-02-08 astro-ph

E. Troja , G. Cusumano , P. O'Brien , B. Zhang , B. Sbarufatti , V. Mangano , R. Willingale , G. Chincarini
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J. P. Osborne F. E. Marshall D. N. Burrows S. Campana N. Gehrels C. Guidorzi H. A. Krimm V. La Parola E. W. Liang T. Mineo A. Moretti K. L. Page P. Romano G. Tagliaferri B. B. Zhang M. J. Page P. Schady
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We present a detailed analysis of Swift multi-wavelength 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 ~2 d 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 ~20 ks 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 towards 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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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. On the Duration of Gamma-Ray Bursts

    astro-ph.HE 2024-12 conditional novelty 4.0 of 10

    GRB duration is shaped by the progenitor, the central engine, the emitter, and geometry, so short versus long duration is not a reliable direct indicator of what exploded or merged.

  2. A review of long lasting activities of the central engine of gamma-ray bursts

    astro-ph.HE 2025-01 unverdicted novelty 1.0 of 10

    A review of ultra-long gamma-ray bursts and X-ray plateau phases as evidence that the central engine keeps working long after the first flash.

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