Earliest detection of the optical afterglow of GRB 030329 and its variability

Rie Sato*, Nobuyuki Kawai, Motoko Suzuki, Youichi Yatsu, Jun Kataoka, Ryo Takagi, Kenshi Yanagisawa, Hitoshi Yamaoka

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


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 powerlaw (α t ) function with indices α1 = 0.88 ± 0.01 (0.047 days < t < tb1), α2 = 1.18 ± 0.01 (tb1 < t < tb2), and α 3 = 1.81 ± 0.04 (tb2 < t < 1.2 days), where tb1 ∼ 0.26 days and tb2 ∼ 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".

Original languageEnglish
Pages (from-to)411-412
Number of pages2
JournalProgress of Theoretical Physics Supplement
Publication statusPublished - 2004
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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