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Modeling the radio and optical/NIR afterglows of GRB 980703: A numerical study

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Abstract

Extensive multi-band afterglow data are available for GRB 980703. Especially, its radio afterglow was very bright and was monitored until more than 1000 days after the trigger time. Additionally, there is no obvious special feature, i.e., no rebrightenings, no plateau, and no special steep decay or slow decay in the multi-band afterglow light curves. All these conditions make GRB 980703 a precious sample in gamma-ray burst research. Here we use the observational data of GRB 980703 to test the standard fireball model in depth. It is found that the model can give a satisfactory explanation to the multi-band and overall afterglow light curves. The beaming angle of GRB 980703 is derived as ∼ 0.23 radian, and the circum-burst medium density is ∼ 27 cm−3. The total isotropic equivalent kinetic energy of the ejecta is ∼ 3.8 × 1052 ergs. A rest-frame extinction of A V ∼ 2.5 mag in the host galaxy is also derived.

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Authors and Affiliations

  1. Department of Astronomy, Nanjing University, Nanjing, 210093, China

    SiWei Kong & YongFeng Huang

  2. Department of Physics, The University of Hong Kong, Pokfulam Road, Hong Kong, China

    KwongSang Cheng

  3. Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing, 210008, China

    Tan Lu

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  1. SiWei Kong
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  2. YongFeng Huang
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Correspondence to YongFeng Huang.

Additional information

Supported by the National Natural Science Foundation of China (Grant Nos. 10625313 and 10973039), the National Basic Research Program of China (Grant No. 2009CB824800), and a GRF Grant of Hong Kong Government (Grant No. HKU701109P)

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Kong, S., Huang, Y., Cheng, K. et al. Modeling the radio and optical/NIR afterglows of GRB 980703: A numerical study. Sci. China Ser. G-Phys. Mech. Astron. 52, 2047–2053 (2009). https://doi.org/10.1007/s11433-009-0275-y

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  • DOI: https://doi.org/10.1007/s11433-009-0275-y

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