The optical rebrightening of GRB100814A: an interplay of forward and reverse shocks?
Abstract
We present a wide data set of gamma-ray, X-ray, UV/Opt/IR (UVOIR), and radio observations of the Swift GRB100814A. At the end of the slow decline phase of the X-ray and optical afterglow, this burst shows a sudden and prominent rebrightening in the optical band only, followed by a fast decay in both bands. The optical rebrightening also shows chromatic evolution. Such a puzzling behaviour cannot be explained by a single component model. We discuss other possible interpretations, and we find that a model that incorporates a long-lived reverse shock and forward shock fits the temporal and spectral properties of GRB100814 the best.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- May 2015
- DOI:
- 10.1093/mnras/stv267
- arXiv:
- arXiv:1312.1648
- Bibcode:
- 2015MNRAS.449.1024D
- Keywords:
-
- radiation mechanism: non-thermal;
- shock waves;
- gamma-ray burst: general;
- Astrophysics - High Energy Astrophysical Phenomena
- E-Print:
- Version resubmitted to MNRAS. 29 pages, 8 figures, 6 tables. Small changes to the abstract. Sections 3 and 4 slightly expanded and modified. Results unchanged. Section 4 has been broken into smaller subsections. Figure 6 improved. Added Table 6 with a summary of the models. Typos and references fixed