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Multiwavelength study of the luminous GRB 210619B observed with Fermi and ASIM

Authors :: M D Caballero-García
Rahul Gupta
S B Pandey
S R Oates
M Marisaldi
A Ramsli
Y-D Hu
A J Castro-Tirado
R Sánchez-Ramírez
P H Connell
F Christiansen
A Kumar Ror
A Aryan
J-M Bai
M A Castro-Tirado
Y-F Fan
E Fernández-García
A Kumar
A Lindanger
A Mezentsev
J Navarro-González
T Neubert
N Østgaard
I Pérez-García
V Reglero
D Sarria
T R Sun
D-R Xiong
J Yang
Y-H Yang
B-B Zhang
Source :: Caballero-García, M D, Gupta, R, Pandey, S B, Oates, S R, Marisaldi, M, Ramsli, A, Hu, Y-D, Castro-Tirado, A J, Sánchez-Ramírez, R, Connell, P H, Christiansen, F, Ror, A K, Aryan, A, Bai, J-M, Castro-Tirado, M A, Fan, Y-F, Fernández-García, E, Kumar, A, Lindanger, A, Mezentsev, A, Navarro-González, J, Neubert, T, Østgaard, N, Pérez-García, I, Reglero, V, Sarria, D, Sun, T R, Xiong, D-R, Yang, J, Yang, Y-H & Zhang, B-B 2022, ' Multi-wavelength study of the luminous GRB 210619B observed with Fermi and ASIM ', Monthly Notices of the Royal Astronomical Society, vol. 519, pp. 3201–3226 . https://doi.org/10.1093/mnras/stac3629
Publication Year :: 2022
Publisher :: Oxford University Press (OUP), 2022.
Abstract: We report on detailed multi-wavelength observations and analysis of the very bright and long GRB 210619B, detected by the Atmosphere-Space Interactions Monitor (ASIM) installed on the International Space Station (ISS) and the Gamma-ray Burst Monitor (GBM) on-board the Fermi mission. Our main goal is to understand the radiation mechanisms and jet composition of GRB 210619B. With a measured redshift of $z$ = 1.937, we find that GRB 210619B falls within the 10 most luminous bursts observed by Fermi so far. The energy-resolved prompt emission light curve of GRB 210619B exhibits an extremely bright hard emission pulse followed by softer/longer emission pulses. The low-energy photon indices ($\alpha_{\rm pt}$) values obtained using the time-resolved spectral analysis of the burst suggest a transition between the thermal (during harder pulse) to non-thermal (during softer pulse) outflow. We examine the correlation between spectral parameters and find that both peak energy and $\alpha_{\rm pt}$ exhibit the flux tracking pattern. The late time broadband photometric dataset can be explained within the framework of the external forward shock model with $\nu_m$ $< \nu_c$ $< \nu_{x}$ (where $\nu_m$, $\nu_c$, and $\nu_{x}$ are the synchrotron peak, cooling-break, and X-ray frequencies, respectively) spectral regime supporting a rarely observed hard electron energy index ($p<br />Comment: 24 pages, 18 figures, 10 tables, accepted for publication in MNRAS