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Synchrotron self-Compton in a radiative-adiabatic fireball scenario: modelling the multiwavelength observations in some Fermi/LAT bursts

Journal Article · · Monthly Notices of the Royal Astronomical Society
 [1];  [2];  [3];  [1];  [4];  [5];  [6]
  1. Univ. Nacional Autonoma de Mexico (UNAM), Mexico City (Mexico)
  2. Univ. of Alabama, Huntsville, AL (United States)
  3. Technical Univ. of Munich (Germany); Max Planck Inst. fuer Physik, Munich (Germany)
  4. National Astronomical Observatory of Japan (NAOJ), Tokyo (Japan); Graduate Univ. for Advanced Studies (SOKENDAI), Tokyo (Japan); Space Science Institute, Boulder, CO (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
  5. Pennsylvania State Univ., University Park, PA (United States)
  6. Univ. degli Studi di Roma Tor Vergata (Italy)

Energetic GeV photons expected from the closest and the most energetic Gamma-ray bursts (GRBs) provide a unique opportunity to study the very-high-energy emission as well as the possible correlations with lower energy bands in realistic GRB afterglow models. In the standard GRB afterglow model, the relativistic homogeneous shock is usually considered to be fully adiabatic, however, it could be partially radiative. Based on the external forward-shock scenario in both stellar wind and constant-density medium, we present a radiative-adiabatic analytical model of the synchrotron self-Compton (SSC) and synchrotron processes considering an electron energy distribution with a power-law index of $$1\lt p\lt 2$$ and $$2\le p$$. We show that the SSC scenario plays a relevant role in the radiative parameter $$\epsilon$$, leading to a prolonged evolution during the slow cooling regime. In a particular case, we derive the Fermi/LAT light curves together with the photons with energies $$\ge 100$$ MeV in a sample of nine bursts from the second Fermi/LAT GRB catalogue that exhibited temporal and spectral indices with $$\gtrsim 1.5$$ and $$\approx 2$$, respectively. These events can hardly be described with closure relations of the standard synchrotron afterglow model, and also exhibit energetic photons above the synchrotron limit. We have modelled the multiwavelength observations of our sample to constrain the microphysical parameters, the circumburst density, the bulk Lorentz factor, and the mechanism responsible for explaining the energetic GeV photons.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Aeronautics and Space Administration (NASA)
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
2586160
Journal Information:
Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 4 Vol. 534; ISSN 1365-2966; ISSN 0035-8711
Publisher:
Oxford University Press (OUP)Copyright Statement
Country of Publication:
United States
Language:
English

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