The shallow‐decay phase in both the optical and X‐ray afterglows of Swift GRB 090529A: energy injection into a wind‐type medium?
作者: L. P. XinA. PozanenkoD. A. KannD. XuJ. GorosabelG. LeloudasJ. Y. WeiM. AndreevS. F. QinM. IbrahimovX. H. HanA. de Ugarte PostigoY. L. QiuJ. S. DengA. VolnovaP. JakobssonA. J. Castro‐TiradoF. AceitunoJ. P. U. FynboJ. WangR. Sanchez‐RamirezV. KouprianovW. K. ZhengJ. C. TelloC. Wu
作者单位: 1National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
2 Space Research Institute (IKI), 8432 Profsoyuznaya str., Moscow, 117997, Russia
3 Thüringer Landessternwarte Tautenburg, Sternwarte 5, 07778, Tautenburg, Germany
4 Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, 2100 Copenhagen, Denmark
5 Instituto de Astrofísica de Andalucía (IAA‐CSIC), PO Box 3004, 18080 Granada, Spain
6 Terskol Branch of Institute of Astronomy of RAS, Kabardino‐Balkaria Republic 361605, Russian Federation
7 International Centre of Astronomical and Medico‐Ecological Research of NASU, 27 Akademika Zabolotnoho str., 03680, Kyiv, Ukraine
8 Ulugh Beg Astronomical Institute, Tashkent 700052, Uzbekistan
9 Sternberg Astronomical Institute, Moscow State University, Universitetsky pr., 13, Moscow 119992, Russia
10 Centre for Astrophysics and Cosmology, Science Institute, University of Iceland, Dunhagi 5, IS‐107 Reykjavik, Iceland
11 Observatorio de Sierra Ne
刊名: Monthly Notices of the Royal Astronomical Society, 2012, Vol.422 (3), pp.2044-2050
来源数据库: Wiley Journal
DOI: 10.1111/j.1365-2966.2012.20681.x
关键词: gamma‐ray burstgeneralgamma‐ray burst: individual: GRB 090529A
原始语种摘要: ABSTRACT(#br)The energy injection model is the usual choice for interpreting the shallow‐decay phase in Swift gamma‐ray burst (GRB) X‐ray afterglows. However, very few GRBs have simultaneous signatures of energy injection in their optical and X‐ray afterglows. Here, we report on the optical observations of GRB 090529A from 2000 s to ∼106 s after the burst, in which an achromatic decay is seen at both wavelengths. The optical light curve shows a decay from 0.37 to 0.99, with a break at ∼105 s. In the same time interval, the decay indices of the X‐ray light curve changed from 0.04 to 1.2. Comparing these values with the closure relations, the segment after 3 × 104 s is consistent with the prediction of the forward shock in an interstellar medium without any...
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