Soft X-ray prompt emission from a high-redshift gamma-ray burst EP240315a
Y. Liu, H. Sun, D. Xu, D. S. Svinkin, J. Delaunay, N. R. Tanvir, H. Gao, C. Zhang, Y. Chen, X. -F. Wu, B. Zhang, W. Yuan, J. An, G. Bruni, D. D. Frederiks, G. Ghirlanda, J. -W. Hu, A. Li, C. -K. Li, J. -D. Li, D. B. Malesani, L. Piro, G. Raman, R. Ricci, E. Troja, S. D. Vergani, Q. -Y. Wu, J. Yang, B. -B. Zhang, Z. -P. Zhu, A. de Ugarte Postigo, A. G. Demin, D. Dobie, Z. Fan, S. -Y. Fu, J. P. U. Fynbo, J. -J. Geng, G. Gianfagna, Y. -D. Hu, Y. -F. Huang, S. -Q. Jiang, P. G. Jonker, Y. Julakanti, J. A. Kennea, A. A. Kokomov, E. Kuulkers, W. -H. Lei, J. K. Leung, A. J. Levan, D. -Y. Li, Y. Li, S. P. Littlefair, X. Liu, A. L. Lysenko, Y. -N. Ma, A. Martin-Carrillo, P. O’Brien, T. Parsotan, J. Quirola-Vasquez, A. V. Ridnaia, S. Ronchini, A. Rossi, D. Mata-Sanchez, B. Schneider, R. -F. Shen, A. L. Thakur, A. Tohuvavohu, M. A. P. Torres, A. E. Tsvetkova, M. V. Ulanov, J. -J. Wei, D. Xiao, Y. -H. I. Yin, M. Bai, V. Burwitz, Z. -M. Cai, F. -S. Chen, H. -L. Chen, T. -X. Chen, W. Chen, Y. -F. Chen, Y. -H. Chen, H. -Q. Cheng, C. -Z. Cui, W. -W. Cui, Y. -F. Dai, Z. -G. Dai, J. Eder, D. -W. Fan, C. Feldman, H. Feng, Z. Feng, P. Friedrich, X. Gao, J. Guan, D. -W Han, J. Han, D. -J. Hou, H. -B. Hu, T. Hu, M. -H. Huang, J. Huo, I. Hutchinson, Z. Ji, S. -M. Jia, Z. -Q. Jia, B. -W. Jiang, C. -C. Jin, G. Jin, J. -J. Jin, A. Keereman, H. Lerman, J. -F. Li, L. -H. Li, M. -S. Li, W. Li, Z. -D. Li, T. -Y. Lian, E. -W. Liang, Z. -X. Ling, C. -Z. Liu, H. -Y. Liu, H. -Q. Liu, M. -J. Liu, Y. -R. Liu, F. -J. Lu, H. -J. LU, L. -D. Luo, F. L. Ma, J. Ma, J. -R. Mao, X. Mao, M. McHugh, N. Meidinger, K. Nandra, J. P. Osborne, H. -W. Pan, X. Pan, M. E. Ravasio, A. Rau, N. Rea, U. Rehman, J. Sanders, A. Santovincenzo, L. -M. Song, J. Su, L. -J. Sun, S. -L. Sun, X. -J. Sun, Y. -Y. Tan, Q. -J. Tang, Y. -H. Tao, J. -Z. Tong, H. Wang, J. Wang, L. Wang, W. -X. Wang, X. -F. Wang, X. -Y. Wang, Y. -L. Wang, Y. -S. Wang, D. -M. Wei, R. Willingale, S. -L. Xiong, H. -T. Xu, J. -J. Xu, X. -P. Xu, Y. -F. Xu, Z. Xu, C. -B. Xue, Y. -L. Xue, A. -L. Yan, F. Yang, H. -N. Yang, X. -T. Yang, Y. -J Yang, Y. -W. Yu, J. Zhang, M. Zhang, S. -N. Zhang, W. -D. Zhang, W. -J. Zhang, Y. -H. Zhang, Z. Zhang, Z. Zhang, Z. -L. Zhang, D. -H. Zhao, H. -S. Zhao, X. -F. Zhao, Z. -J. Zhao, L. -X. Zhou, Y. -L. Zhou, Y. -X. Zhu, Z. -C. Zhu, X. -X. Zuo
arXiv:2404.16425v1 Announce Type: new
Abstract: Long gamma-ray bursts (GRBs) are believed to originate from core collapse of massive stars. High-redshift GRBs can probe the star formation and reionization history of the early universe, but their detection remains rare. Here we report the detection of a GRB triggered in the 0.5–4 keV band by the Wide-field X-ray Telescope (WXT) on board the Einstein Probe (EP) mission, designated as EP240315a, whose bright peak was also detected by the Swift Burst Alert Telescope and Konus-Wind through off-line analyses. At a redshift of $z=4.859$, EP240315a showed a much longer and more complicated light curve in the soft X-ray band than in gamma-rays. Benefiting from a large field-of-view ($sim$3600 deg$^2$) and a high sensitivity, EP-WXT captured the earlier engine activation and extended late engine activity through a continuous detection. With a peak X-ray flux at the faint end of previously known high-$z$ GRBs, the detection of EP240315a demonstrates the great potential for EP to study the early universe via GRBs.arXiv:2404.16425v1 Announce Type: new
Abstract: Long gamma-ray bursts (GRBs) are believed to originate from core collapse of massive stars. High-redshift GRBs can probe the star formation and reionization history of the early universe, but their detection remains rare. Here we report the detection of a GRB triggered in the 0.5–4 keV band by the Wide-field X-ray Telescope (WXT) on board the Einstein Probe (EP) mission, designated as EP240315a, whose bright peak was also detected by the Swift Burst Alert Telescope and Konus-Wind through off-line analyses. At a redshift of $z=4.859$, EP240315a showed a much longer and more complicated light curve in the soft X-ray band than in gamma-rays. Benefiting from a large field-of-view ($sim$3600 deg$^2$) and a high sensitivity, EP-WXT captured the earlier engine activation and extended late engine activity through a continuous detection. With a peak X-ray flux at the faint end of previously known high-$z$ GRBs, the detection of EP240315a demonstrates the great potential for EP to study the early universe via GRBs.

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