The First Pulse of the Extremely Bright GRB 130427A: A Test Lab for Synchrotron Shocks
Abstract
Gamma-ray burst (GRB) 130427A is one of the most energetic GRBs ever observed. The initial pulse up to 2.5 seconds is possibly the brightest well-isolated pulse observed to date. A fine time resolution spectral analysis shows power-law decays of the peak energy from the onset of the pulse, consistent with models of internal synchrotron shock pulses. However, a strongly correlated power-law behavior is observed between the luminosity and the spectral peak energy that is inconsistent with curvature effects arising in the relativistic outflow. It is difficult for any of the existing models to account for all of the observed spectral and temporal behaviors simultaneously.
- Publication:
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Science
- Pub Date:
- January 2014
- DOI:
- 10.1126/science.1242302
- arXiv:
- arXiv:1311.5581
- Bibcode:
- 2014Sci...343...51P
- Keywords:
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- ASTRONOMY Astronomy, Physics;
- Astrophysics - High Energy Astrophysical Phenomena
- E-Print:
- This is the author's version of the work. It is posted here by permission of the AAAS for personal use, not for redistribution. The definitive version was published online in Science Express on 21 November 2013 [DOI:10.1126/science.1242302] 15 pages, 4 figures and 1 table