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

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

2002-11-07

arxiv.org/abs/astro-ph/0211130v1

Astrophys.J. 584 (2003) L43-L46

Astronomy and Astrophysics

Astrophysics

Submitted to ApJL, 14 pages, 4 figures. Data available on anonymous ftp at ftp://cfa-ftp.harvard.edu/pub/kstanek/GRB021004

Scientific paper

10.1086/373888

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 time scales, 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. (2002). 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.

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