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Title: An external shock origin of GRB 141028A

Abstract

The prompt emission of the long, smooth, and single-pulsed gamma-ray burst, GRB 141028A, is analyzed under the guise of an external shock model. First, we fit the γ-ray spectrum with a two-component photon model, namely, synchrotron+blackbody, and then fit the recovered evolution of the synchrotron νF ν peak to an analytic model derived considering the emission of a relativistic blast wave expanding into an external medium. The prediction of the model for the νF ν peak evolution matches well with the observations. We observe the blast wave transitioning into the deceleration phase. Furthermore, we assume the expansion of the blast wave to be nearly adiabatic, motivated by the low magnetic field deduced from the observations. This allows us to recover within an order of magnitude the flux density at the νF ν peak, which is remarkable considering the simplicity of the analytic model. Under this scenario we argue that the distinction between prompt and afterglow emission is superfluous as both early-time emission and late-time emission emanate from the same source. In conclusion, while the external shock model is clearly not a universal solution, this analysis opens the possibility that at least some fraction of GRBs can be explained with anmore » external shock origin of their prompt phase.« less

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2];  [3]; ORCiD logo [4]; ORCiD logo [4]
  1. Oskar Klein Centre for Cosmoparticle Physics, AlbaNova, Stockholm (Sweden); KTH Royal Inst. of Technology, Stockholm (Sweden). AlbaNova Univ. Center, Dept. of Physics
  2. Stanford Univ., CA (United States). Kavli Inst. for Particle Astrophysics and Cosmology, W. W. Hansen Experimental Physics Lab., Dept. of Physics; SLAC National Accelerator Lab., Menlo Park, CA (United States)
  3. Univ. College Cork, Cork (Ireland). Dept. of Physics
  4. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States); KTH Royal Inst. of Technology, Stockholm (Sweden)
Sponsoring Org.:
USDOE; National Aeronautic and Space Administration (NASA); Alternative Energies and Atomic Energy Commission (CEA) (France)
Contributing Org.:
Fermi LAT Collaboration
OSTI Identifier:
1355695
Grant/Contract Number:  
AC02-76SF00515; GO4-15073Z; NAS8-03060
Resource Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 822; Journal Issue: 2; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; gamma-ray burst; radiation mechanisms non-thermal; radiation mechanisms thermal

Citation Formats

Burgess, J. Michael, Bégué, Damien, Ryde, Felix, Omodei, Nicola, Pe'er, Asaf, Racusin, J. L., and Cucchiara, A. An external shock origin of GRB 141028A. United States: N. p., 2016. Web. doi:10.3847/0004-637X/822/2/63.
Burgess, J. Michael, Bégué, Damien, Ryde, Felix, Omodei, Nicola, Pe'er, Asaf, Racusin, J. L., & Cucchiara, A. An external shock origin of GRB 141028A. United States. doi:10.3847/0004-637X/822/2/63.
Burgess, J. Michael, Bégué, Damien, Ryde, Felix, Omodei, Nicola, Pe'er, Asaf, Racusin, J. L., and Cucchiara, A. Thu . "An external shock origin of GRB 141028A". United States. doi:10.3847/0004-637X/822/2/63. https://www.osti.gov/servlets/purl/1355695.
@article{osti_1355695,
title = {An external shock origin of GRB 141028A},
author = {Burgess, J. Michael and Bégué, Damien and Ryde, Felix and Omodei, Nicola and Pe'er, Asaf and Racusin, J. L. and Cucchiara, A.},
abstractNote = {The prompt emission of the long, smooth, and single-pulsed gamma-ray burst, GRB 141028A, is analyzed under the guise of an external shock model. First, we fit the γ-ray spectrum with a two-component photon model, namely, synchrotron+blackbody, and then fit the recovered evolution of the synchrotron νF ν peak to an analytic model derived considering the emission of a relativistic blast wave expanding into an external medium. The prediction of the model for the νF ν peak evolution matches well with the observations. We observe the blast wave transitioning into the deceleration phase. Furthermore, we assume the expansion of the blast wave to be nearly adiabatic, motivated by the low magnetic field deduced from the observations. This allows us to recover within an order of magnitude the flux density at the νF ν peak, which is remarkable considering the simplicity of the analytic model. Under this scenario we argue that the distinction between prompt and afterglow emission is superfluous as both early-time emission and late-time emission emanate from the same source. In conclusion, while the external shock model is clearly not a universal solution, this analysis opens the possibility that at least some fraction of GRBs can be explained with an external shock origin of their prompt phase.},
doi = {10.3847/0004-637X/822/2/63},
journal = {The Astrophysical Journal (Online)},
number = 2,
volume = 822,
place = {United States},
year = {2016},
month = {5}
}

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    Works referencing / citing this record:

    Bulk Lorentz factors of gamma-ray bursts
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