Chromatic Afterglow of GRB 200829A

Authors :: Pankov, N. S.
Pozanenko, A. S.
Minaev, P. Yu.
Belkin, S. O.
Volnova, A. A.
Reva, I. V.
Serebryanskiy, A. V.
Krugov, M. A.
Naroenkov, S. A.
Novichonok, A. O.
Zhornichenko, A. A.
Rumyantsev, V. V.
Antonyuk, K. A.
Egamberdiev, Sh. A.
Burkhonov, O. A.
Klunko, E. V.
Moskvitin, A. S.
Molotov, I. E.
Inasaridze, R. Ya.
Pankov, N. S.
Pozanenko, A. S.
Minaev, P. Yu.
Belkin, S. O.
Volnova, A. A.
Reva, I. V.
Serebryanskiy, A. V.
Krugov, M. A.
Naroenkov, S. A.
Novichonok, A. O.
Zhornichenko, A. A.
Rumyantsev, V. V.
Antonyuk, K. A.
Egamberdiev, Sh. A.
Burkhonov, O. A.
Klunko, E. V.
Moskvitin, A. S.
Molotov, I. E.
Inasaridze, R. Ya.
Publication Year :: 2023
Abstract: We present the results of our analysis of multiwavelength observations for the long gamma-ray burst GRB 200829A. The burst redshift $z \approx 1.29 \pm 0.04$ has been determined photometrically at the afterglow phase. In gamma rays the event is one of the brightest (in isotropic equivalent), $E_{iso} \gtrsim 10^{54}$ erg. The multicolor light curve of the GRB 200829A afterglow is characterized by chromatic behavior and the presence of a plateau gradually transitioning into a power-law decay that can also be interpreted as a quasi-synchronous inhomogeneity (flare). We assume that the presence of a chromatic inhomogeneity in the early afterglow is consistent with the model of a structured jet.<br />Comment: 18 pages, 14 figures

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