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Spectral Hardening Reveals Afterglow Emergence in Long-duration Fast X-Ray Transients: A Case Study of GRB 250404A/EP250404a

  • Authors: Yi-Han Iris Yin, Yuan Fang, Bin-Bin Zhang, Chen Deng, Jun Yang, Run-Chao Chen, Yuan Liu, Yehao Cheng, Dong Xu, Xiaofeng Wang, Rongfeng Shen, Rui-Zhi Li, Jirong Mao, Wen-Xiong Li, Alberto Javier Castro-Tirado, Weihua Lei, Shao-Yu Fu, Yuan-Pei Yang, Shuai-Qing Jiang, Jie An, Chun Chen, Zhong-Nan Dong, Guowang Du, Ali Esamdin, Zhou Fan, Haicheng Feng, Lu Feng, Emilio Fernández-García, Xing Gao, Maria Gritsevich, Wei-Jian Guo, Jingwei Hu, You-Dong Hu, Yanlong Hua, Abdusamatjan Iskandar, Junjie Jin, Niu Li, Xia Li, Ziwei Li, Jia-Qi Lin, Dezi Liu, Jinzhong Liu, Qichun Liu, Xiaowei Liu, Xing Liu, Daniele B. Malesani, Ignacio Pérez-García, Hui Sun, Xue-Feng Wu, Yun-Ao Xiao, Ding-Rong Xiong, Shengyu Yan, Beibei Zhang, Jinghua Zhang, Haichang Zhu, Zipei Zhu, Hu Zou, Weimin Yuan, Bing Zhang

Yi-Han Iris Yin et al 2025 The Astrophysical Journal Letters 989 .

  • Provider: AAS Journals

Caption: Figure 5.

The spectral index evolutions and light curves for four scenarios of the transition from the prompt emission to the afterglow in the long-duration fast X-ray transients. The purple, blue, and yellow dots represent the spectral indices of the total, prompt, and afterglow emission spectra. The colored curves demonstrate the flux evolution in linear and logarithmic scale. From top to bottom: case I, case II, case III, and case IV.

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