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Chromatic Afterglow of GRB 200829A

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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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  1. ftp://legacy.gsfc.nasa.gov/fermi/data/

  2. http://fermi.gsfc.nasa.gov/ssc/data/analysis/rmfit/

  3. https://www.swift.ac.uk/burst_analyser/

  4. http://isdc.unige.ch/savchenk/spiacs-online/spiacs-ipnlc.pl

  5. https://www.swift.ac.uk/burst_analyser/00993768/

  6. https://gcn.gsfc.nasa.gov/other/200829A.gcn3

  7. http://www.not.iac.es/observing/forms/fitsarchive/

  8. https://github.com/lmfit/lmfit-py/

  9. https://www.swift.ac.uk/burst_analyser/00993768/

  10. https://heasarc.gsfc.nasa.gov/ftools

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ACKNOWLEDGMENTS

N.S. Pankov, A.S. Pozanenko, P.Yu. Minaev, S.O. Belkin, E.V. Klunko, and A.A. Volnova thank the Ministry of Education and Science of the Russian Federation for its financial support, project no. 075-15-2022-1221 (2022-BRICS-8847-2335). In this work we used the data supplied by the UK Swift Science Data Centre at the University of Leicester. Based on observations made with the Nordic Optical Telescope, owned in collaboration by the University of Turku and Aarhus University, and operated jointly by Aarhus University, the University of Turku and the University of Oslo, representing Denmark, Finland and Norway, the University of Iceland and Stockholm University at the Observatorio del Roque de los Muchachos, La Palma, Spain, of the Instituto de Astrofisica de Canarias.

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Authors and Affiliations

  1. National Research University ‘‘Higher School of Economics’’, 101000, Moscow, Russia

    N. S. Pankov, A. S. Pozanenko & S. O. Belkin

  2. Space Research Institute, Russian Academy of Sciences, 117997, Moscow, Russia

    N. S. Pankov, A. S. Pozanenko, P. Yu. Minaev, S. O. Belkin & A. A. Volnova

  3. Lebedev Physical Institute, Russian Academy of Sciences, 119991, Moscow, Russia

    P. Yu. Minaev

  4. Fesenkov Astrophysical Institute, Almaty, Kazakhstan

    I. V. Reva, A. V. Serebryanskii & M. A. Krugov

  5. Institute of Astronomy, Russian Academy of Sciences, 119017, Moscow, Russia

    S. A. Naroenkov

  6. Petrozavodsk State University, 185035, Petrozavodsk, Russia

    A. O. Novichonok & A. A. Zhornichenko

  7. Crimean Astrophysical Observatory, Russian Academy of Sciences, 298409, Nauchny, Russia

    V. V. Rumyantsev & K. A. Antonyuk

  8. Ulugh Beg Astronomical Institute, 100052, Tashkent, Uzbekistan

    Sh. A. Egamberdiev & O. A. Burkhonov

  9. Institute of Solar-Terrestrial Physics, Russian Academy of Sciences, Siberian Branch, 664033, Irkutsk, Russia

    E. V. Klunko

  10. Special Astrophysical Observatory, Russian Academy of Sciences, 369167, Nizhnii Arkhyz, Karachai-Cherkessian Republic, Russia

    A. S. Moskvitin

  11. Keldysh Institute of Applied Mathematics, Russian Academy of Sciences, 125047, Moscow, Russia

    I. E. Molotov

  12. Evgeni Kharadze Georgian National Astrophysical Observatory, 0301, Abastumani, Georgia

    R. Ya. Inasaridze

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  1. N. S. Pankov
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  5. A. A. Volnova
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Correspondence to N. S. Pankov.

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Translated by V. Astakhov

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Pankov, N.S., Pozanenko, A.S., Minaev, P.Y. et al. Chromatic Afterglow of GRB 200829A. Astron. Lett. 49, 81–109 (2023). https://doi.org/10.1134/S1063773723030052

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  • DOI: https://doi.org/10.1134/S1063773723030052

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