GRB 130831a: Rise and demise of a magnetar at z = 0.5

Massimiliano De Pasquale, Mathew J. Page, Silvia Zane, Alice A. Breeveld, Samantha R. Oates, Alberto J. Castro-Tirado, Javier Gorosabel, Judith L. Racusin, Eleonora Troja, Antonino Cucchiara, Amy Lien, Neil Gehrels, Harvey Moseley, Alexander Kutyrev, David A. Kann, Bing Zhang, Alexei Pozanenko, Alina A. Volnova, Adam Trotter, Nathan FrankDaniel E. Reichart, Joshua B. Haislip, Boris Sbarufatti, Nathaniel Butler, Owen Littlejohns, Steve Schulze, Zach Cano, Ori Fox, Joshua Bloom, Jason X. Prochaska, José A. De Diego, Jesús Gonzalez, Alan M. Watson, Michael G. Richer, Carlos Román-Zúñiga, Vivian Hoette, Rebecca R. Russell, Vasilij Rumyantsev, Evgeny Klunko, Otabek Burkhonov

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Gamma-ray bursts (GRBs) are the brightest explosions in the universe, yet the properties of their energy sources are far from understood. Very important clues, however, can be deduced by studying the afterglows of these events. We present observations of GRB 130831A and its afterglow obtained with Swift, Chandra, and multiple ground-based observatories. This burst shows an uncommon drop in the X-ray light curve at about 100 ks after the trigger, with a decay slope of α 7. The standard Forward Shock (FS) model offers no explanation for such a behaviour. Instead, a model in which a newly born magnetar outflow powers the early X-ray emission is found to be viable. After the drop, the X-ray afterglow resumes its decay with a slope typical of FS emission. The optical emission, on the other hand, displays no clear break across the X-ray drop and its decay is consistent with that of the late X-rays. Using both the X-ray and optical data, we show that the FS model can explain the emission after 100 ks. We model our data to infer the kinetic energy of the ejecta and thus estimate the efficiency of a magnetar “central engine” of a GRB. Furthermore, we break down the energy budget of this GRB into prompt emission, late internal dissipation, kinetic energy of the relativistic ejecta, and compare it with the energy of the accompanying supernova, SN 2013fu.

Original languageEnglish (US)
Title of host publication14th Marcel Grossman Meeting On Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories, Proceedings
EditorsMassimo Bianchi, Robert T Jantzen, Remo Ruffini, Remo Ruffini
PublisherWorld Scientific Publishing Co. Pte Ltd
Pages2981-2988
Number of pages8
ISBN (Electronic)9789813226593
DOIs
StatePublished - 2018
Event14th Marcel Grossman Meeting On Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories - Rome, Italy
Duration: Jul 12 2015Jul 18 2015

Publication series

Name14th Marcel Grossman Meeting On Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories, Proceedings

Conference

Conference14th Marcel Grossman Meeting On Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories
CountryItaly
CityRome
Period7/12/157/18/15

Keywords

  • Magnetar

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Astronomy and Astrophysics

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  • Cite this

    De Pasquale, M., Page, M. J., Zane, S., Breeveld, A. A., Oates, S. R., Castro-Tirado, A. J., Gorosabel, J., Racusin, J. L., Troja, E., Cucchiara, A., Lien, A., Gehrels, N., Moseley, H., Kutyrev, A., Kann, D. A., Zhang, B., Pozanenko, A., Volnova, A. A., Trotter, A., ... Burkhonov, O. (2018). GRB 130831a: Rise and demise of a magnetar at z = 0.5. In M. Bianchi, R. T. Jantzen, R. Ruffini, & R. Ruffini (Eds.), 14th Marcel Grossman Meeting On Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories, Proceedings (pp. 2981-2988). (14th Marcel Grossman Meeting On Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories, Proceedings). World Scientific Publishing Co. Pte Ltd. https://doi.org/10.1142/9789813226609_0375