The first swift X-ray flash: The faint afterglow of XRF 050215B

A. J. Levan, J. P. Osborne, N. R. Tanvir, K. L. Page, E. Rol, B. Zhang, M. R. Goad, P. T. O'Brien, R. S. Priddey, D. Bersier, D. N. Burrows, R. Chapman, A. S. Fruchter, P. Giommi, N. Gehrels, M. A. Hughes, S. Pak, C. Simpson, G. Tagliaferri, E. Vardoulaki

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

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 center of the error box as reported by the BAT. Infrared data obtained at UKIRT after 10 hr also revealed a very faint K-band afterglow. The afterglow appears unusual since it is very faint, especially in the infrared, with K > 20 only 9 hr postburst. The X-ray and infrared light curves exhibit a slow, monotonic decay with α ∼ 0.8 and no evidence for a steepening associated with the jet break to 10 days postburst. We discuss possible explanations for the faintness and slow decay in the context of present models for the production of X-ray flashes.

Original languageEnglish (US)
Pages (from-to)1132-1138
Number of pages7
JournalAstrophysical Journal
Volume648
Issue number2 I
DOIs
StatePublished - Sep 10 2006

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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