Early afterglow detection in the Swift observations of GRB 050801

Details Early afterglow detection in the Swift observations of GRB 050801 Early afterglow detection in the Swift observations of GRB 050801

2007-03-16

arxiv.org/abs/astro-ph/0703447v1

Mon.Not.Roy.Astron.Soc.377:1638-1646,2007

Astronomy and Astrophysics

Astrophysics

13 pages, 7 figs, Accepted for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2007.11724.x

We present results of Swift optical, UV and X-ray observations of the afterglow of GRB 050801. The source is visible over the full optical, UV and X-ray energy range of the Swift UVOT and XRT instruments.Both optical and X-ray lightcurves exhibit a broad plateau (\Delta t/t ~ 1) during the first few hundred seconds after the gamma-ray event. We investigate the multiwavelength spectral and timing properties of the afterglow, and we suggest that the behaviour at early times is compatible with an energy injection by a newly born magnetar with a period of a few tenths of a millisecond, which keeps the forward shock refreshed over this short interval by irradiation. Reverse shock emission is not observed. Its suppression might be due to GRB ejecta being permeated by high magnetic fields, as expected for outflows powered by a magnetar.Finally, the multiwavelength study allows a determination of the burst redshift, z=1.56.

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