Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-05-10
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.
Bersier David
Burrows David N.
Chapman Robert
Fruchter Andrew S.
Gehrels Neil
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