Extremely luminous optical afterglow of a distant and energetic gamma-ray burst GRB 230204B

Rahul, G.; Racusin, J.; Lipunov, V.; Hu, Y.D.; Gulati, A.; Castro-Tirado, A.J.; Murphy, T.; Serino, M.; Zhirkov, K.; Shilling, S.; Oates, S.R.; Leung, J.K.; Parsotan, T.; Ror, A.K.; Pandey, S.B.; Iyyani, S.; Sharma, V.; Aryan, A.; Bai, J.; Balanutsa, P.; Buckley, D.; Caballero-García, M.D.; Carrasco-García, I.M.; Castellón, A.; Castillo, S.; Cui, C.; Fan, Y.; Fernández-García, E.; García-Segura, G.; Gritsevich, M.; Guziy, S.; Hiriart, D.; Lee, W.H.; Jeong, S.; Pérez del Pulgar, C.J.; Olivares, I.; Park, I.H.; Pérez-García, I.; Razzaque, S.; Sánchez-Ramírez, R.; Tyurina, N.; Topolev, V.; Wang, C.; Wu, S.; Xin, Y.; Xiong, D.; Zhao, X.; Mao, J.; Bao-Li Lun; Kai, Y.

Авторы: Rahul Gupta, Racusin Judith, Lipunov Vladimir, Hu Y.D., Gulati Ashna, Castro-Tirado Alberto J., Murphy Tara, Serino Motoko, Zhirkov Kirill, Shilling S., Oates Samantha R., Leung James K., Parsotan T., Ror Amit K., Pandey Shashi B., Iyyani S., Sharma V., Aryan A., Bai Jin-Ming, Balanutsa Pavel, Buckley David, Caballero-García María D., Carrasco-García I.M., Castellón A., Castillo Sebastián, Cui Chen-Zhou, Fan Yu-Feng, Fernández-García Emilio, García-Segura Guillermo, Gritsevich Maria, Guziy Sergiy, Hiriart David, Lee William H., Jeong Soomin, Pérez del Pulgar Carlos Jesus, Olivares Ignacio, Park I.H., Pérez-García Ignacio, Razzaque S., Sánchez-Ramírez Rubén, Tyurina Nataly, Topolev Vladislav, Wang Chuan-Jun, Wu Si-Yu, Xin Yu-Xin, Xiong Ding-Rong, Zhao Xiao-Hong, Mao Jirong, Bao-Li Lun, Kai Ye
Журнал: ArXiv e-prints
Том: 12
Номер: 2412
Год издания: 2024
Номер статьи: 18152
DOI: 10.48550/arXiv.2412.18152
Аннотация: https://doi.org/10.48550/arXiv.2412.18152http://arxiv.org/abs/2412.18152Robotic telescope networks play an important role in capturing early and bright optical afterglows, providing critical insights into the energetics and emission mechanisms of GRBs. In this study, we analyze GRB 230204B, an exceptionally energetic and multi-pulsed long GRB, detected by the Fermi GBM and MAXI detectors, with an isotropic equivalent gamma-ray energy exceeding 1054 erg. Time-resolved spectral analysis reveals a transition in the prompt emission from hard (sub-photospheric dominated) spectra during early pulses to softer (synchrotron radiation dominated) spectra in later pulses, indicative of a hybrid jet composition. We report the discovery and characterization of the optical afterglow using the MASTER and BOOTES robotic telescope networks, alongside long-term radio observations extending to 335 days post-burst with the ATCA. At ~1.3 ks post-burst, the optical luminosity was exceptionally high, surpassing even other bright GRBs, such as GRB 221009A (the ``BOAT"). Multi-wavelength modeling, incorporating data from MASTER, BOOTES, DOT, Swift/XRT, and radio observations, was conducted using an external ISM forward-shock top-hat jet model with afterglowpy. The results reveal a narrow and highly collimated jet with a circumburst density of n0 ~ 28.12 cm−3, kinetic energy EK ~ 4.18 x 1055 erg, and a relatively low value of ϵB = 2.14 x 10−6, indicating shock-compression of the magnetic field in the surrounding interstellar medium. We constrained a low radiative efficiency of ~ 4.3 %. This study highlights the indispensable contribution of robotic networks to early afterglow observations and advances our understanding of GRB 230204B unique characteristics and underlying jet physics.
Добавил в систему: Липунов Владимир Михайлович

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Extremely luminous optical afterglow of a distant and energetic gamma-ray burst GRB 230204Bстатья

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