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ID 34751
file
creator
Huang, KY
Urata, Y
Tung, YH
Lin, HM
Xin, LP
Yoshida, M
Zheng, W
Akerlof, C
Wang, SY
Ip, WH
Lehner, MJ
Bianco, FB
Kawai, N
Kuroda, D
Marshall, SL
Schwamb, ME
Qiu, Y
Wang, JH
Wen, CY
Wei, J
Yanagisawa, K
Zhang, ZW
subject
gamma-ray burst: individual (GRB 071112C)
NDC
Astronomy. Space sciences
abstract
We present a study on GRB 071112C X-ray and optical light curves. In these two wavelength ranges, we have found different temporal properties. The R-band light curve showed an initial rise followed by a single power-law decay, while the X-ray light curve was described by a single power-law decay plus a flare-like feature. Our analysis shows that the observed temporal evolution cannot be described by the external shock model in which the X-ray and optical emission are produced by the same emission mechanism. No significant color changes in multi-band light curves and a reasonable value of the initial Lorentz factor (Gamma(0) = 275 +/- 20) in a uniform interstellar medium support the afterglow onset scenario as the correct interpretation for the early R band rise. The result suggests that the optical flux is dominated by afterglow. Our further investigations show that the X-ray flux could be created by an additional feature related to energy injection and X-ray afterglow. Different theoretical interpretations indicate the additional feature in X-ray can be explained by either late internal dissipation or local inverse-Compton scattering in the external shock.
journal title
Astrophysical Journal
volume
Volume 748
issue
Issue 1
start page
44
date of issued
2012
publisher
IOP Publishing Ltd
issn
0004-637X
ncid
publisher doi
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
publisher
rights
(c) 2012. The American Astronomical Society. All rights reserved.
relation url
department
Hiroshima Astrophysical Science Center