GRB 190530A was jointly observed by the High Energy X-ray Telescope of the Hard X-ray Modulation Telescope (Insight-HXMT/HE) and the Ground-Based Wide-Angle Camera network (GWAC-N) with the extremely large field of view. After triggered by Insight-HXMT/HE and Fermi/GBM, we observed the optical emission of GRB 190530A, using the 30 cm telescope of GWAC (GWAC-F30) to search and locate its position. Subsequent observation of the late afterglow of GRB 190530A was made with the 2.16 m telescope at Xinglong Observatory. In this paper, we make a detailed exploration of the origin of GRB 190530A. In the prompt emission, a"double-tracking"pattern is presented both for the low-energy spectral indexαand the peak energy Ep in the Band function with Insight-HXMT/HE and Fermi/GBM data;the results of GRB 190530A are consistent with the Amati and Yonetoku correlations; the spectral lag (τ) versus energy (E) can be estimated with τ=-3.0 ± 0.06+( 0.17 ± 0.03 ) log E . The synchrotron radiation can account for the origin of GRB 190530A prompt emission behaviors. The α and Ep of the precursor are essentially the same as that of the main prompt emission, implying that they have the same origin. For the afterglow, it can be described with the external forward shock model in ISM circumburst medium. In summary, from precursor, prompt emission to afterglow of GRB 190530A all originated from synchrotron radiation.

Hui-Ya Liu;Xiang-Gao Wang;Li-Ping Xin;Zi-Min Zhou;Liang-Jun Chen;Bing Li;Yuan-Gui Yang;Qi Luo;Cheng-Kui Li;Shao-Lin Xiong;Ling-Jun Wang;Xu-Hui Han;Li-Ming Song;Jian-Yan Wei;En-Wei Liang;Shuang-Nan Zhang

Guangxi Key Laboratory for Relativistic Astrophysics,Department of Physics,Guangxi University,Nanning 530004,China;GXU-NAOC Center for Astrophysics and Space Sciences,Nanning 530004,China;CAS Key Laboratory of Space Astronomy and Technology,National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China;Key Laboratory of Particle Astrophysics,Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China;School of Physics and Electronic Information,Huaibei Normal University,Huaibei 235000,China

天文和天体物理学研究

[1]Hui-Ya Liu;Xiang-Gao Wang;Li-Ping Xin;Zi-Min Zhou;Liang-Jun Chen;Bing Li;Yuan-Gui Yang;Qi Luo;Cheng-Kui Li;Shao-Lin Xiong;Ling-Jun Wang;Xu-Hui Han;Li-Ming Song;Jian-Yan Wei;En-Wei Liang;Shuang-Nan Zhang-.GRB 190530A:From Precursor, Prompt Emission to Afterglow all Originated from Synchrotron Radiation)[J].天文和天体物理学研究,2022(06):22-32

190530A,Afterglow,GWAC,Xinglong,Amati,Yonetoku,06+,circumburst

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