Multicolor shallow decay and chromatic breaks in the GRB 050319 optical afterglow

• Huang, K. Y.

• 浦田, 裕次

• Kuo, P. H.

• Ip, W. H.

• Ioka, K.

• Aoki, T.

• Chen, C. W.

• Chen, W. P.

• Isogai, M.

• Lin, H. C.

• Makishima, K.

• Mito, H.

• Miyata, T.

• Nakada, Y.

• Nishiura, S.

• Onda, K.

• Qiu, Y.

• Soyano, T.

• Tamagawa, T.

• Tarusawa, K.

• 田代, 信

• Yoshioka, T.

Abstract

type:text

Multiwavelength observations of the optical afterglow of GRB 050319 were performed from 1.31 to 9.92 hr after the burst. Our R-band light curves, combined with other published data, can be described by the smooth broken power-law function, with alpha(1) = -0.84 +/- 0.02 to alpha(2) = -0.48 +/- 0.03, 0.04 days after the gamma-ray burst. The optical light curves are characterized by shallow decays - as was also observed in the X-rays - which may have a similar origin, related to energy injection. However, our observations indicate that there is still a puzzle concerning the chromatic breaks in the R-band light curve (at 0.04 days) and the X-ray light curve (at 0.004 days) that remains to be solved.

Journal

• The Astrophysical Journal Letters

  The Astrophysical Journal Letters 654 (1), L25-L28, 2007

  American Astronomical Society

Keywords

• gamma rays : bursts

Details

• CRID: 1050001337817935488
• NII Article ID: 120006385451
• ISSN: 0004637X
• Web Site: http://id.nii.ac.jp/1586/00012959/
• Text Lang: en
• Article Type: journal article
• Data Source:
  • IRDB
  • CiNii Articles