GRANDMA and HXMT observations of GRB 221009A: The standard luminosity Afterglow of a hyperluminous Gamma-Ray Burst—In Gedenken an David Alexander Kann

0581800 - FZÚ 2024 RIV US eng J - Journal Article
Kann, D.A. - Agayeva, S. - Aivazyan, V. - Karpov, Sergey … Total 116 authors
GRANDMA and HXMT observations of GRB 221009A: The standard luminosity Afterglow of a hyperluminous Gamma-Ray Burst—In Gedenken an David Alexander Kann.
Astrophysical Journal Letters. Roč. 948, č. 2 (2023), č. článku L12. ISSN 2041-8205. E-ISSN 2041-8213
R&D Projects: GA MŠMT EF15_003/0000437
Grant - others:OP VVV - CoGraDS(XE) CZ.02.1.01/0.0/0.0/15_003/0000437
Institutional support: RVO:68378271
Keywords : optical astronomy * optical telescopes * interstellar dust extinction * gamma-ray bursters
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 7.9, year: 2022
Method of publishing: Open access

Object GRB 221009A is the brightest gamma-ray burst (GRB) detected in more than 50 yr of study. In this paper, we present observations in the X-ray and optical domains obtained by the GRANDMA Collaboration and the Insight Collaboration. We study the optical afterglow with empirical fitting using the GRANDMA+HXMT-LE data sets augmented with data from the literature up to 60 days. We then model numerically using a Bayesian approach, and we find that the GRB afterglow, extinguished by a large dust column, is most likely behind a combination of a large Milky Way dust column and moderate low-metallicity dust in the host galaxy. Using the GRANDMA+HXMT-LE+XRT data set, we find that the simplest model, where the observed afterglow is produced by synchrotron radiation at the forward external shock during the deceleration of a top-hat relativistic jet by a uniform medium, fits the multiwavelength observations only moderately well.
Permanent Link: https://hdl.handle.net/11104/0349953