The first Swift X-ray Flash: The faint afterglow of XRF 050215B

Details The first Swift X-ray Flash: The faint afterglow of XRF 050215B The first Swift X-ray Flash: The faint afterglow of XRF 050215B

2006-05-10

arxiv.org/abs/astro-ph/0605256v1

Astrophys.J.648:1132-1138,2006

Astronomy and Astrophysics

Astrophysics

8 pages, 5 figures, accepted for publication in ApJ

Scientific paper

10.1086/506018

We present the discovery of XRF 050215B and its afterglow. The burst was detected by the Swift BAT during the check-out phase and observations with the X-ray telescope began approximately 30 minutes after the burst. These observations found a faint, slowly fading X-ray afterglow near the centre of the error box as reported by the BAT. Infrared data, obtained at UKIRT after 10 hours also revealed a very faint K-band afterglow. The afterglow appear unusual since it is very faint, especially in the infrared with K>20 only 9 hours post burst. The X-ray and infrared lightcurves exhibit a slow, monotonic decay with alpha=0.8 and no evidence for steepening associated with the jet break to 10 days post burst. We discuss possible explanations for the faintness and slow decay in the context of present models for the production of X-ray Flashes.

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