The unusual optical afterglow of the gamma-ray burst GRB 021004: Color changes and short-timescale variability

D. Bersier, K. Z. Stanek, J. N. Winn, T. Grav, M. J. Holman, T. Matheson, B. Mochejska, D. Steeghs, A. R. Walker, P. M. Garnavich, J. Quinn, S. Jha, K. H. Cook, W. W. Craig, P. J. Meintjes, J. J. Calitz

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Abstract

We report UBVRI observations of the optical afterglow of the gamma-ray burst GRB 021004. We observed significant (∼10%-20%) deviations from a power-law decay on several timescales, ranging from a few hours down to 20-30 minutes. We also observed a significant color change starting ∼1.5 days after the burst, confirming the spectroscopic results already reported by Matheson et al. We discuss these results in the context of several models that have recently been proposed to account for the anomalous photometric behavior of this event.

Original languageEnglish (US)
Pages (from-to)L43-L46
JournalAstrophysical Journal
Volume584
Issue number2 II
DOIs
StatePublished - Feb 20 2003
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Gamma rays: bursts

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    Bersier, D., Stanek, K. Z., Winn, J. N., Grav, T., Holman, M. J., Matheson, T., Mochejska, B., Steeghs, D., Walker, A. R., Garnavich, P. M., Quinn, J., Jha, S., Cook, K. H., Craig, W. W., Meintjes, P. J., & Calitz, J. J. (2003). The unusual optical afterglow of the gamma-ray burst GRB 021004: Color changes and short-timescale variability. Astrophysical Journal, 584(2 II), L43-L46. https://doi.org/10.1086/373888