EP240801a/XRF 240801B: An X-Ray Flash Detected by the Einstein Probe and the Implications of Its Multiband Afterglow

Shuai-Qing, J.; Xu, D.; van Hoof Agnes, P.C.; Lei, W.; Liu, Y.; Zhou, H.; Chen, Y.; Fu, S.; Yang, J.; Liu, X.; Zhu, Z.; Filippenko, A.V.; Jonker, P.G.; Pozanenko, A.S.; Gao, H.; Wu, X.; Zhang, B.; Lamb, G.P.; De Pasquale, M.; Kobayashi, S.; Bauer, F.E.; Sun, H.; Pugliese, G.; An, J.; D’Elia, V.; Fynbo Johan, P.U.; Zheng, W.; Castro-Tirado, A.J.; Yin, Y.I.; Zou, Y.; Deller, A.T.; Pankov, N.S.; Volnova, A.A.; Moskvitin, A.S.; Spiridonova, O.I.; Oparin, D.V.; Rumyantsev, V.; Burkhonov, O.A.; Egamberdiyev, S.A.; Kim, V.; Krugov, M.; Tatarnikov, A.M.; Inasaridze, R.; Levan, A.J.; Malesani, D.B.; Ravasio, M.E.; Quirola-Vásquez, J.; van Dalen Joyce, N.D.; Sánchez-Sierras, J.; Mata, S.D.; Littlefair, S.P.; Chacón, J.A.; Torres Manuel, A.P.; Chrimes, A.A.; Sarin, N.; Martin-Carrillo, A.; Dhillon, V.; Yang, Y.; Brink, T.G.; Davies, R.L.; Yang, S.; Aryan, A.; Chen, T.; Kong Albert, K.H.; Li Wen-Xiong; Li Rui-Zhi; Mao, J.; Pérez-García, I.; Fernández-García, E.J.; Andrews, M.; Farah, J.; Fan, Z.; Padilla, G.E.; Howell, D.A.; Hartmann, D.; Hu, J.; Jakobsson, P.; Li Cheng-Kui; Ling, Z.; McCully, C.; Newsome, M.; Schneider, B.; Tinyanont, K.S.; Sun, N.; Terreran, G.; Tang, Q.; Wang, W.; Xu, J.; Yuan, W.; Zhang, B.; Zhao, H.; Zhang, J.

Авторы: Shuai-Qing Jiang, Xu Dong, van Hoof Agnes P.C., Lei Wei-Hua, Liu Yuan, Zhou Hao, Chen Yong, Fu Shao-Yu, Yang Jun, Liu Xing, Zhu Zi-Pei, Filippenko Alexei V., Jonker Peter G., Pozanenko A.S., Gao He, Wu Xue-Feng, Zhang Bing, Lamb Gavin P., De Pasquale Massimiliano, Kobayashi Shiho, Bauer Franz Erik, Sun Hui, Pugliese Giovanna, An Jie, D’Elia Valerio, Fynbo Johan P.U., Zheng WeiKang, Castro-Tirado Alberto J., Yin Yi-Han Iris, Zou Yuan-Chuan, Deller Adam T., Pankov N.S., Volnova A.A., Moskvitin A.S., Spiridonova O.I., Oparin D.V., Rumyantsev V., Burkhonov O.A., Egamberdiyev Sh A., Kim V., Krugov M., Tatarnikov A.M., Inasaridze R., Levan Andrew J., Malesani Daniele Bjørn, Ravasio Maria E., Quirola-Vásquez Jonathan, van Dalen Joyce N.D., Sánchez-Sierras Javi, Mata Sánchez Daniel, Littlefair Stuart P., Chacón Jennifer A., Torres Manuel A.P., Chrimes Ashley A., Sarin Nikhil, Martin-Carrillo Antonio, Dhillon Vik, Yang Yi, Brink Thomas G., Davies Rebecca L., Yang Sheng, Aryan Amar, Chen Ting-Wan, Kong Albert K.H., Li Wen-Xiong, Li Rui-Zhi, Mao Jirong, Pérez-García Ignacio, Fernández-García Emilio J., Andrews Moira, Farah Joseph, Fan Zhou, Padilla Gonzalez Estefania, Howell D.Andrew, Hartmann Dieter, Hu Jing-Wei, Jakobsson Páll, Li Cheng-Kui, Ling Zhi-Xing, McCully Curtis, Newsome Megan, Schneider Benjamin, Tinyanont Kaew Samaporn, Sun Ning-Chen, Terreran Giacomo, Tang Qing-Wen, Wang Wen-Xin, Xu Jing-Jing, Yuan Wei-Min, Zhang Bin-Bin, Zhao Hai-Sheng, Zhang Juan
Журнал: Astrophysical Journal Letters
Том: 988
Номер: 1
Год издания: 2025
Первая страница: L34
DOI: 10.3847/2041-8213/addebf
Аннотация: We present multiband observations and analysis of EP240801a, a low-energy, extremely soft gamma-ray burst (GRB) discovered on 2024 August 1 by the Einstein Probe (EP) satellite with a weak contemporaneous signal also detected by the Fermi Gamma-ray Burst Monitor (GBM). Optical spectroscopy of the afterglow, obtained by Gran Telescopio Canarias and Keck, identified the redshift of z = 1.6734. EP240801a exhibits a burst duration of 148 s in X-rays and 22.3 s in gamma rays, with X-rays leading by 80.61 s. Spectral lag analysis indicates that the gamma-ray signal arrived 8.3 s earlier than the X-rays. Joint spectral fitting of EP Wide-field X-ray Telescopeand Fermi/GBM data yields an isotropic energy( )= ×+ E 5.57 10 erg,iso 0.50 0.54 51 , a peak energy=Epeak+14.90 keV4.71 7.08, and a fluence ratio S(25–50 keV)/S( – ) = +50 100 keV 1.67 0.46 0.74 , classifying EP240801a as an X-ray flash (XRF). The host-galaxy continuum spectrum, inferred using Prospector, was used to correct its contribution for the observed outburst optical data. Unusual early R-band behavior and EP Follow-up X-ray Telescope observations suggest multiple components in the afterglow. Three models are considered: a two-component jet model, a forward-reverse shock model, and a forward shock model with energy injection. All three provide reasonable explanations. The two-component jet model and the energy injection model imply a relatively small initial energy and velocity of the jet in the line of sight, while the forward-reverse shock model remainstypical. Under the two-component jet model, EP240801a may resemble GRB 221009A (BOAT) if the bright narrow beam is viewed on-axis. Therefore, EP240801a can be interpreted as an off-beam (narrow) jet or an intrinsically weak GRB jet. Our findings provide crucial clues for uncovering the origin of XRFs
Добавил в систему: Татарников Андрей Михайлович

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EP240801a/XRF 240801B: An X-Ray Flash Detected by the Einstein Probe and the Implications of Its Multiband Afterglowстатья

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