학술논문

Soft X-ray prompt emission from a high-redshift gamma-ray burst EP240315a
Document Type
Working Paper
Author
Liu, Y.Sun, H.Xu, D.Svinkin, D. S.Delaunay, J.Tanvir, N. R.Gao, H.Zhang, C.Chen, Y.Wu, X. -F.Zhang, B.Yuan, W.An, J.Bruni, G.Frederiks, D. D.Ghirlanda, G.Hu, J. -W.Li, A.Li, C. -K.Li, J. -D.Malesani, D. B.Piro, L.Raman, G.Ricci, R.Troja, E.Vergani, S. D.Wu, Q. -Y.Yang, J.Zhang, B. -B.Zhu, Z. -P.Postigo, A. de UgarteDemin, A. G.Dobie, D.Fan, Z.Fu, S. -Y.Fynbo, J. P. U.Geng, J. -J.Gianfagna, G.Hu, Y. -D.Huang, Y. -F.Jiang, S. -Q.Jonker, P. G.Julakanti, Y.Kennea, J. A.Kokomov, A. A.Kuulkers, E.Lei, W. -H.Leung, J. K.Levan, A. J.Li, D. -Y.Li, Y.Littlefair, S. P.Liu, X.Lysenko, A. L.Ma, Y. -N.Martin-Carrillo, A.O'Brien, P.Parsotan, T.Quirola-Vasquez, J.Ridnaia, A. V.Ronchini, S.Rossi, A.Mata-Sanchez, D.Schneider, B.Shen, R. -F.Thakur, A. L.Tohuvavohu, A.Torres, M. A. P.Tsvetkova, A. E.Ulanov, M. V.Wei, J. -J.Xiao, D.Yin, Y. -H. I.Bai, M.Burwitz, V.Cai, Z. -M.Chen, F. -S.Chen, H. -L.Chen, T. -X.Chen, W.Chen, Y. -F.Chen, Y. -H.Cheng, H. -Q.Cui, C. -Z.Cui, W. -W.Dai, Y. -F.Dai, Z. -G.Eder, J.Fan, D. -W.Feldman, C.Feng, H.Feng, Z.Friedrich, P.Gao, X.Guan, J.Han, D. -WHan, J.Hou, D. -J.Hu, H. -B.Hu, T.Huang, M. -H.Huo, J.Hutchinson, I.Ji, Z.Jia, S. -M.Jia, Z. -Q.Jiang, B. -W.Jin, C. -C.Jin, G.Jin, J. -J.Keereman, A.Lerman, H.Li, J. -F.Li, L. -H.Li, M. -S.Li, W.Li, Z. -D.Lian, T. -Y.Liang, E. -W.Ling, Z. -X.Liu, C. -Z.Liu, H. -Y.Liu, H. -Q.Liu, M. -J.Liu, Y. -R.Lu, F. -J.LU, H. -J.Luo, L. -D.Ma, F. L.Ma, J.Mao, J. -R.Mao, X.McHugh, M.Meidinger, N.Nandra, K.Osborne, J. P.Pan, H. -W.Pan, X.Ravasio, M. E.Rau, A.Rea, N.Rehman, U.Sanders, J.Santovincenzo, A.Song, L. -M.Su, J.Sun, L. -J.Sun, S. -L.Sun, X. -J.Tan, Y. -Y.Tang, Q. -J.Tao, Y. -H.Tong, J. -Z.Wang, H.Wang, J.Wang, L.Wang, W. -X.Wang, X. -F.Wang, X. -Y.Wang, Y. -L.Wang, Y. -S.Wei, D. -M.Willingale, R.Xiong, S. -L.Xu, H. -T.Xu, J. -J.Xu, X. -P.Xu, Y. -F.Xu, Z.Xue, C. -B.Xue, Y. -L.Yan, A. -L.Yang, F.Yang, H. -N.Yang, X. -T.Yang, Y. -JYu, Y. -W.Zhang, J.Zhang, M.Zhang, S. -N.Zhang, W. -D.Zhang, W. -J.Zhang, Y. -H.Zhang, Z.Zhang, Z. -L.Zhao, D. -H.Zhao, H. -S.Zhao, X. -F.Zhao, Z. -J.Zhou, L. -X.Zhou, Y. -L.Zhu, Y. -X.Zhu, Z. -C.Zuo, X. -X.
Source
Subject
Astrophysics - High Energy Astrophysical Phenomena
Language
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.
Comment: 41 pages, 8 figures, 7 tables