Article

Multicolor Shallow Decay and Chromatic Breaks in the GRB 050319 Optical Afterglow

K. Y. HuangInstitute of Astronomy, National Central University, Chung-Li, TaiwanY. UrataDepartment of Physics, Saitama University, Shimo-Okubo, Sakura, Saitama, JapanP. H. KuoInstitute of Astronomy, National Central University, Chung-Li, TaiwanWing‐Huen IpInstitute of Astronomy, National Central University, Chung-Li, TaiwanKunihito IokaDepartment of Physics, Kyoto University, Kyoto, JapanTsutomu AokiKiso Observatory, Institute of Astronomy, University of Tokyo, Mitake-mura, Kiso-gun, Nagano, JapanC. W. ChenInstitute of Astronomy, National Central University, Chung-Li, TaiwanW. P. ChenInstitute of Astronomy, National Central University, Chung-Li, TaiwanM. IsogaiKiso Observatory, Institute of Astronomy, University of Tokyo, Mitake-mura, Kiso-gun, Nagano, JapanH. C. LinInstitute of Astronomy, National Central University, Chung-Li, TaiwanKazuo MakishimaDepartment of Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo, JapanHiroyuki MitoKiso Observatory, Institute of Astronomy, University of Tokyo, Mitake-mura, Kiso-gun, Nagano, JapanTakashi MiyataKiso Observatory, Institute of Astronomy, University of Tokyo, Mitake-mura, Kiso-gun, Nagano, JapanY. NakadaKiso Observatory, Institute of Astronomy, University of Tokyo, Mitake-mura, Kiso-gun, Nagano, JapanS. NishiuraDepartment of Astronomy and Earth Sciences, Tokyo Gakugei University, Koganei, Tokyo, JapanK. OndaDepartment of Physics, Saitama University, Shimo-Okubo, Sakura, Saitama, JapanY. QiuNational Astronomical Observatories, Chinese Academy of Sciences, Beijing, ChinaTakao SoyanoKiso Observatory, Institute of Astronomy, University of Tokyo, Mitake-mura, Kiso-gun, Nagano, JapanToru TamagawaRIKEN, Hirosawa, Wako, Saitama, JapanKen’ichi TarusawaKiso Observatory, Institute of Astronomy, University of Tokyo, Mitake-mura, Kiso-gun, Nagano, JapanM. TashiroDepartment of Physics, Saitama University, Shimo-Okubo, Sakura, Saitama, JapanT. YoshiokaDepartment of Physics, Nagoya University, Furo-cho, Chikusa, Nagoya, Aichi, Japan

2006en

ABI

Abstract

Multi-wavelength B, V, R, I observations of the optical afterglow of GRB 050319 were performed by the 1.05-m telescope at Kiso Observatory and the 1.0-m telescope at Lulin Observatory from 1.31 hours to 9.92 hours after the burst. Our R band lightcurves, combined with other published data, can be described by the smooth broken power-law function, with $\\alpha_1$ = -0.84 $\\pm$0.02 to $\\alpha_2$ = -0.48$\\pm$0.03, 0.04 days after the GRB. The optical lightcurves 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 lightcurve (at 0.04 days) and the X-ray lightcurve (at 0.004 days) that remains to be solved.

Identifiers

DOI: 10.1086/510737

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