Soft X-ray prompt emission from the high-redshift gamma-ray burst EP240315a
journal contribution
posted on 2025-02-28, 11:35 authored by Y Liu, H Sun, D Xu, DS Svinkin, J Delaunay, Nial TanvirNial Tanvir, H Gao, C Zhang, Y Chen, X-F Wu, B Zhang, W Yuan, J An, G Bruni, DD Frederiks, G Ghirlanda, J-W Hu, A Li, C-K Li, J-D Li, DB Malesani, L Piro, G Raman, R Ricci, E Troja, SD Vergani, Q-Y Wu, J Yang, B-B Zhang, Z-P Zhu, A de Ugarte Postigo, AG Demin, D Dobie, Z Fan, S-Y Fu, JPU Fynbo, J-J Geng, G Gianfagna, Y-D Hu, Y-F Huang, S-Q Jiang, PG Jonker, Y Julakanti, JA Kennea, AA Kokomov, E Kuulkers, W-H Lei, JK Leung, AJ Levan, D-Y Li, Y Li, SP Littlefair, X Liu, AL Lysenko, Y-N Ma, A Martin-Carrillo, P O’Brien, T Parsotan, J Quirola-Vásquez, AV Ridnaia, S Ronchini, A Rossi, D Mata-Sánchez, B Schneider, R-F Shen, AL Thakur, A Tohuvavohu, MAP Torres, AE Tsvetkova, MV Ulanov, J-J Wei, D Xiao, Y-HI 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, B Cordier, C-Z Cui, W-W Cui, Y-F Dai, Z-G Dai, J Eder, RAJ Eyles-Ferris, D-W Fan, C Feldman, H Feng, Z Feng, P Friedrich, X Gao, J-F Gonzalez, 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 Lü, L-D Luo, FL Ma, J Ma, J-R Mao, X Mao, M McHugh, N Meidinger, K Nandra, JP Osborne, H-W Pan, X Pan, ME 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, C-Y Wang, 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-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 ZuoLong 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 (~3,600°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.
History
Author affiliation
College of Science & Engineering Physics & AstronomyVersion
- AM (Accepted Manuscript)
