Earliest Detection of the Optical Afterglow of GRB 030329 and Its Variability(Poster)

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We report an earliest detection of an optical afterglow of GRB 030329 at the Tokyo Institute of Technology (Tokyo, Japan). Our observation started 67 minutes after the burst and continued for two succeeding nights. Combining our data with those reported in GCN, we find that the early afterglow light curve of the first half day is described by a broken power-law (∝t^<-α>) function with indices α_1=0.88±0.01 (0.047 days < t < t_<b1>), α_2=1.18±0.01 (t_<b1> < t < t_<b2>), and α_3=1.81±0.04 (t_<b2> < t < 1.2 days), where t_<b1>〜0.26 days and t_<b2>〜0.54 days, respectively. The change of the power-law index at the first break at t〜0.26 days is consistent with that expected from a "cooling break".
理論物理学刊行会の論文
2004-11-15