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      The 80 Ms follow-up of the X-ray afterglow of GRB 130427A challenges the standard forward shock model

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          Abstract

          GRB 130427A was the brightest gamma-ray burst detected in the last 30 years. With an equivalent isotropic energy output of \(8.5\times10^{53}\) erg and redshift \(z=0.34\), it uniquely combined very high energetics with a relative proximity to Earth. As a consequence, its X-ray afterglow has been detected by sensitive X-ray observatories such as XMM-Newton and Chandra for a record-breaking baseline longer than 80 million seconds. We present the X-ray light-curve of this event over such an interval. The light-curve shows a simple power-law decay with a slope \(\alpha = 1.309 \pm 0.007\) over more than three decades in time (47 ks - 83 Ms). We discuss the consequences of this result for a few models proposed so far to interpret GRB 130427A, and more in general the significance of this outcome in the context of the standard forward shock model. We find that this model has difficulty in explaining our data, in both cases of constant density and stellar-wind circumburst media, and requires far-fetched values for the physical parameters involved.

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          Author and article information

          Journal
          2016-02-12
          2016-02-15
          Article
          10.1093/mnras/stw1704
          1602.04158
          9a20904a-da65-485e-b1c5-3aa1bb0a014f

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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          Custom metadata
          11 pages, 2 tables, 1 figure. Erroneously added pages removed. Article submitted to MNRAS
          astro-ph.HE

          High energy astrophysical phenomena
          High energy astrophysical phenomena

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