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Título: | GRB 190919B: Rapid optical rise explained as a flaring activity |
Autor: | Jelínek, Martin CSIC ORCID; Topinka, Martin; Karpov, Sergey; Maleňáková, Alžběta; Hu, Y. D.; Rigoselli, Michela; Štrobl, Jan; Ebr, Jan; Cunniffe, Ronan; Thoene, Christina; Mašek, Martin; Janeček, Petr; Fernández-García, E.; Hiriart, David; Lee, William H.; Vítek, Stanislav; Hudec, René; Trávníček, Petr; Castro-Tirado, Alberto J. CSIC ORCID ; Prouza, Michael | Palabras clave: | Techniques: photometric Gamma-ray burst: individual: GRB190919B |
Fecha de publicación: | 30-jun-2022 | Editor: | EDP Sciences | Citación: | Astronomy & Astrophysics 662: A126 (2022) | Resumen: | Following the detection of a long GRB 190919B by INTEGRAL (INTErnational Gamma-Ray Astrophysics Laboratory), we obtained an optical photometric sequence of its optical counterpart. The light curve of the optical emission exhibits an unusually steep rise ∼100 s after the initial trigger. This behaviour is not expected from a ‘canonical’ GRB optical afterglow. As an explanation, we propose a scenario consisting of two superimposed flares: an optical flare originating from the inner engine activity followed by the hydrodynamic peak of an external shock. The inner-engine nature of the first pulse is supported by a marginal detection of flux in hard X-rays. The second pulse eventually concludes in a slow constant decay, which, as we show, follows the closure relations for a slow cooling plasma expanding into the constant interstellar medium and can be seen as an optical afterglow sensu stricto. © ESO 2022. | Versión del editor: | http://dx.doi.org/10.1051/0004-6361/202143010 | URI: | http://hdl.handle.net/10261/285731 | DOI: | 10.1051/0004-6361/202143010 | ISSN: | 0004-6361 | E-ISSN: | 1432-0746 |
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2022A&A...662A.126J.pdf | 1 MB | Adobe PDF | Visualizar/Abrir |
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