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X-ray spectral components observed in the afterglow of GRB 130925A

Bellm, EC and Barrière, NM and Bhalerao, V and Boggs, SE and Cenko, SB and Christensen, FE and Craig, WW and Forster, K and Fryer, CL and Hailey, CJ and Harrison, FA and Horesh, A and Kouveliotou, C and Madsen, KK and Miller, JM and Ofek, EO and Perley, DA and Rana, VR and Reynolds, SP and Stern, D and Tomsick, JA and Zhang, WW (2014) X-ray spectral components observed in the afterglow of GRB 130925A. The Astrophysical Journal Letters, 784 (2). ISSN 2041-8205

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We have identified spectral features in the late-time X-ray afterglow of the unusually long, slow-decaying GRB 130925A using NuSTAR, Swift/X-Ray Telescope, and Chandra. A spectral component in addition to an absorbed power law is required at >4σ significance, and its spectral shape varies between two observation epochs at 2 × 105 and 106 s after the burst. Several models can fit this additional component, each with very different physical implications. A broad, resolved Gaussian absorption feature of several keV width improves the fit, but it is poorly constrained in the second epoch. An additive blackbody or second power-law component provide better fits. Both are challenging to interpret: the blackbody radius is near the scale of a compact remnant (108 cm), while the second power-law component requires an unobserved high-energy cutoff in order to be consistent with the non-detection by Fermi/Large Area Telescope. © 2014. The American Astronomical Society. All rights reserved.

Item Type: Article
Uncontrolled Keywords: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: American Astronomical Society
Date Deposited: 18 May 2017 10:20
Last Modified: 10 Sep 2017 19:23
DOI or Identification number: 10.1088/2041-8205/784/2/L19
URI: http://researchonline.ljmu.ac.uk/id/eprint/6471

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