Extensive multiband study of the X-ray rich GRB050408 A likely off-axis event with an intense energy injection

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Aims. Understand the shape and implications of the multiband light curve of GRB 050408, an X-ray rich (XRR) burst. Methods. We present a multiband optical light curve, covering the time from the onset of the gamma-ray event to several months after, when we only detect the host galaxy. Together with X-ray, millimetre and radio observations we compile what, to our knowledge, is the most complete multiband coverage of an XRR burst afterglow to date. Results. The optical and X-ray light curve is characterised by an early flattening and an intense bump peaking around 6 days after the burst onset. We explain the former by an off-axis viewed jet, in agreement with the predictions made for XRR by some models, and the latter with an energy injection equivalent in intensity to the initial shock. The analysis of the spectral flux distribution reveals an extinction compatible with a low chemical enrichment surrounding the burst. Together with the detection of an underlying starburst host galaxy we can strengthen the link between XRR and classical long-duration bursts.

出版社版: http://www.aanda.org/index.php?option=article&access=doi&doi=10.1051/0004-6361:20066660

identifier:http://www.aanda.org/index.php?option=article&access=doi&doi=10.1051/0004-6361:20066660

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詳細情報 詳細情報について

  • CRID
    1050564287771358592
  • NII論文ID
    120006385452
  • ISSN
    00046361
  • Web Site
    http://id.nii.ac.jp/1586/00012960/
  • 本文言語コード
    en
  • 資料種別
    journal article
  • データソース種別
    • IRDB
    • CiNii Articles
    • KAKEN

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