The Flat Decay Phase in the Early X-Ray Afterglows of Swift GRBs

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Many Swift GRBs show an early phase of shallow decay in their X-ray afterglows, lasting from t {approx} 10{sup 2.5} s to {approx} 10{sup 4} s after the GRB, where the flux decays as {approx} t{sup -0.2} - t{sup -0.8}. This is perhaps the most mysterious of the new features discovered by Swift in the early X-ray afterglow, since it is still not clear what causes it. I discuss different possible explanations for this surprising new discovery, as well as their potential implications for the gamma-ray efficiency, the afterglow kinetic energy, and perhaps even for the physics of collisionless relativistic ... continued below

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Granot, Jonathan & /KIPAC, Menlo Park March 27, 2007.

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Many Swift GRBs show an early phase of shallow decay in their X-ray afterglows, lasting from t {approx} 10{sup 2.5} s to {approx} 10{sup 4} s after the GRB, where the flux decays as {approx} t{sup -0.2} - t{sup -0.8}. This is perhaps the most mysterious of the new features discovered by Swift in the early X-ray afterglow, since it is still not clear what causes it. I discuss different possible explanations for this surprising new discovery, as well as their potential implications for the gamma-ray efficiency, the afterglow kinetic energy, and perhaps even for the physics of collisionless relativistic shocks.

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  • Journal Name: Submitted to Nuovo Cim.; Conference: To appear in the proceedings of Swift and GRBs: Unveiling the Relativistic Universe, San Servolo, Venice, 5-9 Jun 2006

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  • Report No.: SLAC-PUB-12418
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 901580
  • Archival Resource Key: ark:/67531/metadc878781

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  • March 27, 2007

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  • Sept. 22, 2016, 2:13 a.m.

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  • Dec. 5, 2016, 4:15 p.m.

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Granot, Jonathan & /KIPAC, Menlo Park. The Flat Decay Phase in the Early X-Ray Afterglows of Swift GRBs, article, March 27, 2007; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc878781/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.