A.J. van der Horst
A. de Ugarte Postigo
- Constraining the energy budget of GRB 080721
- Monthly Notices of the Royal Astronomical Society
- Volume | Issue number
- 400 | 1
- Pages (from-to)
- Document type
- Faculty of Science (FNWI)
- Anton Pannekoek Institute for Astronomy (API)
We follow the bright, highly energetic afterglow of Swift-discovered GRB 080721 at z = 2.591 out to 36 d or 3 x 10(6) s since the trigger in the optical and X-ray bands. We do not detect a break in the late-time light curve inferring a limit on the opening angle of theta(j) >= 7 degrees.3 and setting tight constraints on the total energy budget of the burst of E-gamma >= 9.9 x 10(51) erg within the fireball model. To obey the fireball model closure relations, the gamma-ray burst (GRB) jet must be expanding into a homogeneous surrounding medium and likely lies behind a significant column of dust. The energy constraint we derive can be used as an observational input for models of the progenitors of long GRBs: we discuss how such high collimation-corrected energies could be accommodated with certain parameters of the standard massive star core-collapse models. We can, however, most probably rule out a magnetar progenitor for this GRB which would require 100 per cent efficiency to reach the observed total energy.
- go to publisher's site
- DOI: 10.1111/j.1365-2966.2009.15443.x; eprintid: arXiv:0812.2490
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