Chromatic Afterglow of GRB 200829A
N. PankovNational Research University ‘‘Higher School of Economics’’, 101000, Moscow, RussiaA. PozanenkoNational Research University ‘‘Higher School of Economics’’, 101000, Moscow, RussiaP. Yu. MinaevLebedev Physical Institute, Russian Academy of Sciences, 119991, Moscow, RussiaS. BelkinNational Research University ‘‘Higher School of Economics’’, 101000, Moscow, RussiaA. VolnovaSpace Research Institute, Russian Academy of Sciences, 117997, Moscow, RussiaI. RevaFesenkov Astrophysical Institute, Almaty, KazakhstanA. V. SerebryanskiiFesenkov Astrophysical Institute, Almaty, KazakhstanM. KrugovFesenkov Astrophysical Institute, Almaty, KazakhstanS. А. NaroenkovInstitute of Astronomy, Russian Academy of Sciences, 119017, Moscow, RussiaA. NovichonokPetrozavodsk State University, 185035, Petrozavodsk, RussiaA. ZhornichenkoPetrozavodsk State University, 185035, Petrozavodsk, RussiaV. RumyantsevCrimean Astrophysical Observatory, Russian Academy of Sciences, 298409, Nauchny, RussiaK. A. AntonyukCrimean Astrophysical Observatory, Russian Academy of Sciences, 298409, Nauchny, RussiaШ. А. ЭгамбердиевUlugh Beg Astronomical Institute, 100052, Tashkent, UzbekistanО. БурхоновUlugh Beg Astronomical Institute, 100052, Tashkent, UzbekistanE. KlunkoInstitute of Solar-Terrestrial Physics, Russian Academy of Sciences, Siberian Branch, 664033, Irkutsk, RussiaА. С. МосквитинSpecial Astrophysical Observatory, Russian Academy of Sciences, 369167, Nizhnii Arkhyz, Karachai-Cherkessian Republic, RussiaI. MolotovKeldysh Institute of Applied Mathematics, Russian Academy of Sciences, 125047, Moscow, RussiaR. InasaridzeEvgeni Kharadze Georgian National Astrophysical Observatory, 0301, Abastumani, Georgia
ABI
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), $$E_{\textrm{iso}}\gtrsim 10^{54}$$ 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.
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