SIMBAD references

2018ApJ...857..140Z - Astrophys. J., 857, 140-140 (2018/April-3)

Modeling the multiband afterglows of GRB 060614 and GRB 060908: further evidence for a double power-law hard electron energy spectrum.


Abstract (from CDS):

Electrons accelerated in relativistic collisionless shocks are usually assumed to follow a power-law energy distribution with an index of p. Observationally, although most gamma-ray bursts (GRBs) have afterglows that are consistent with p > 2, there are still a few GRBs suggestive of a hard (p < 2) electron energy spectrum. Our previous work showed that GRB 091127 gave strong evidence for a double power-law hard electron energy (DPLH) spectrum with 1 < p1 < 2, p2 > 2 and an "injection break" assumed as γb ∝ γq in the highly relativistic regime, where γ is the bulk Lorentz factor of the jet. In this paper, we show that GRB 060614 and GRB 060908 provide further evidence for such a DPLH spectrum. We interpret the multiband afterglow of GRB 060614 with the DPLH model in a homogeneous interstellar medium by taking into account a continuous energy injection process, while, for GRB 060908, a wind-like circumburst density profile is used. The two bursts, along with GRB 091127, suggest a similar behavior in the evolution of the injection break, with q ∼ 0.5. Whether this represents a universal law of the injection break remains uncertain and more afterglow observations such as these are needed to test this conjecture.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): acceleration of particles - gamma-ray burst: individual: (GRB 060614, GRB 060908) - radiation mechanisms: non-thermal

Simbad objects: 5

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