Chromatic Afterglow of GRB 200829A

N. S. Pankov (1,2); A. S. Pozanenko (2); P. Yu. Minaev (2,3); S. O.; Belkin (1,2); A. A. Volnova (2); I. V. Reva (4); A. V. Serebryanskiy (4); M.; A. Krugov (4); S. A. Naroenkov (5); A. O. Novichonok (6); A. A. Zhornichenko; (6); V. V. Rumyantsev (7); K. A. Antonyuk (7); Sh. A. Egamberdiev (8); O. A.; Burkhonov (8); E. V. Klunko (9); A. S. Moskvitin (10); I. E. Molotov (11); R.; Ya. Inasaridze (12) ((1); National Research Institute "Higher School of; Economics"; Moscow; Russia; (2) Space Research Institute; Russian Academy of; Sciences; Moscow; Russia; (3) Lebedev Physical Institute; Russian Academy of; Sciences; Moscow; Russia; (4) Fesenkov Astrophysical Institute; Almaty,; Kazakhstan; (5) Institute of Astronomy; Moscow; Russia; (6) Petrozavodsk; State University; Petrozavodsk; Russia; (7) Crimean Astrophysical; Observatory; Nauchny; Crimea; (8) Mirzo Ulug'bek nomidagi Astronomiya; instituti; Toshkent; O`zbekiston; (9) Institute of Solar-Terrestrial Physics,; Russian Academy of Sciences; Siberian Branch; Irkutsk; Russia; (10) Special; Astrophysical Observatory; Russian Academy of Sciences; Nizhnii Arkhyz,; Russia; (11) Keldysh Institute of Applied Mathematics; Moscow; Russia; (12); Evgeni Kharadze Georgian National Astrophysical Observatory; Abastumani,; Georgia)

arXiv:2308.02090·astro-ph.HE·August 7, 2023

Chromatic Afterglow of GRB 200829A

N. S. Pankov (1,2), A. S. Pozanenko (2), P. Yu. Minaev (2,3), S. O., Belkin (1,2), A. A. Volnova (2), I. V. Reva (4), A. V. Serebryanskiy (4), M., A. Krugov (4), S. A. Naroenkov (5), A. O. Novichonok (6), A. A. Zhornichenko, (6), V. V. Rumyantsev (7), K. A. Antonyuk (7)

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TL;DR

This paper analyzes multiwavelength observations of GRB 200829A, revealing a chromatic afterglow with a plateau and inhomogeneity, supporting a structured jet model for the burst's behavior.

Contribution

It provides the first detailed multiwavelength analysis of GRB 200829A's chromatic afterglow and supports the structured jet model for its inhomogeneous features.

Findings

01

Chromatic behavior observed in the afterglow light curve.

02

Presence of a plateau transitioning into a power-law decay.

03

Support for the structured jet model based on inhomogeneity analysis.

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), $E_{i so} ≳ 1 0^{54}$ 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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