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

Bellm, EC, Barrière, NM, Bhalerao, V, Boggs, SE, Cenko, SB, Christensen, FE, Craig, WW, Forster, K, Fryer, CL, Hailey, CJ, Harrison, FA, Horesh, A, Kouveliotou, C, Madsen, KK, Miller, JM, Ofek, EO, Perley, DA, Rana, VR, Reynolds, SP, Stern, D , 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: 17 May 2022 09:49
DOI or ID number: 10.1088/2041-8205/784/2/L19
URI: https://researchonline.ljmu.ac.uk/id/eprint/6471
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