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Multicolor Shallow Decay and Chromatic Breaks in the GRB 050319 Optical Afterglow
Author(s) -
K. Y. Huang,
Y. Urata,
P. H. Kuo,
WingHuen Ip,
Kunihito Ioka,
Tsutomu Aoki,
C. W. Chen,
W. P. Chen,
M. Isogai,
H. C. Lin,
Kazuo Makishima,
Hiroyuki Mito,
Takashi Miyata,
Y. Nakada,
S. Nishiura,
K. Onda,
Y. Qiu,
Takao Soyano,
Toru Tamagawa,
K. Tarusawa,
M. Tashiro,
T. Yoshioka
Publication year - 2006
Publication title -
the astrophysical journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.376
H-Index - 489
eISSN - 1538-4357
pISSN - 0004-637X
DOI - 10.1086/510737
Subject(s) - afterglow , light curve , gamma ray burst , chromatic scale , physics , astrophysics , power law , blue light , optics , statistics , mathematics
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

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