@article{oai:sucra.repo.nii.ac.jp:00012965, author = {Huang, K. Y. and 浦田, 裕次 and Kuo, P. H. and Ip, W. H. and Ioka, K. and Aoki, T. and Chen, C. W. and Chen, W. P. and Isogai, M. and Lin, H. C. and Makishima, K. and Mito, H. and Miyata, T. and Nakada, Y. and Nishiura, S. and Onda, K. and Qiu, Y. and Soyano, T. and Tamagawa, T. and Tarusawa, K. and 田代, 信 and Yoshioka, T.}, issue = {1}, journal = {The Astrophysical Journal Letters}, month = {}, note = {Multiwavelength observations of the optical afterglow of GRB 050319 were performed from 1.31 to 9.92 hr after the burst. Our R-band light curves, combined with other published data, can be described by the smooth broken power-law function, with alpha(1) = -0.84 +/- 0.02 to alpha(2) = -0.48 +/- 0.03, 0.04 days after the gamma-ray burst. The optical light curves are characterized by shallow decays - as was also observed in the X-rays - which may have a similar origin, related to energy injection. However, our observations indicate that there is still a puzzle concerning the chromatic breaks in the R-band light curve (at 0.04 days) and the X-ray light curve (at 0.004 days) that remains to be solved., text, application/pdf}, pages = {L25--L28}, title = {Multicolor shallow decay and chromatic breaks in the GRB 050319 optical afterglow}, volume = {654}, year = {2007}, yomi = {ウラタ, ユウジ and タシロ, マコト} }