期刊
ASTROPHYSICAL JOURNAL
卷 665, 期 1, 页码 599-607出版社
IOP PUBLISHING LTD
DOI: 10.1086/519450
关键词
gamma rays : bursts; X-rays : individual (GRB 070110)
资金
- STFC [ST/F006489/1, PP/E001173/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/F006489/1, PP/E001173/1] Funding Source: researchfish
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(4) 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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