Optical shallow decay and re-brightening phase of early afterglow

Y. Urata, K. Y. Huang, W. H. Ip, J. Hu, Y. Qiu, P. H. Kuo, Y. H. Li, T. Tamagawa, M. Tashiro, K. Onda, K. Abe, K. Ioka, M. Kuwahara, W. K. Zheng, M. Zhai, J. Y. Wei, J. S. Deng, N. Kodaka, K. Masuno

Research output: Contribution to journalArticlepeer-review


Utilizing East Asian GRB Follow-up Observation Network (EAFON), we have obtained 3 major results; 1) first long-term monitoring of short GRB afterglow from ∼ 0.1 days after the burst, 2) multi band monitoring of early optical shallow decay and re-brightening phase, 3) catch about 30 high-redshift GRB candidates. In this paper, we present shallow decay phase and re-brightening phase of early optical afterglow. Our results imply that these phases are unlikely to be caused by the variable external density model. Overall 1 day light curve behavior may be explained by Patchy shell model and/or different emission region such as 2 jets model rather than to be described by refreshed shock scenario.

Original languageEnglish
Pages (from-to)1601-1603
Number of pages3
JournalNuovo Cimento della Societa Italiana di Fisica B
Issue number12
StatePublished - Dec 2006


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