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Constraining the energy budget of GRB 080721

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Starling, R. L. C., Rol, E., Horst, A. J. van der (Alexander J. van der), Yoon, S. -C., Pal'shin, V., Ledoux, C., Page, K. L., Fynbo, J. P. U., Wiersema, K., Tanvir, N. R. et al.
. (2009) Constraining the energy budget of GRB 080721. Monthly Notices of the Royal Astronomical Society, Vol.400 (No.1). pp. 90-99. ISSN 0035-8711

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Abstract

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.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science > Physics
Journal or Publication Title: Monthly Notices of the Royal Astronomical Society
Publisher: Wiley
ISSN: 0035-8711
Official Date: 21 November 2009
Volume: Vol.400
Number: No.1
Number of Pages: 10
Page Range: pp. 90-99
Identification Number: 10.1111/j.1365-2966.2009.15443.x
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Funder: NASA, DOE SciDAC Program, Marie Curie European Re-Integration Grant, Icelandic Research Fund, Russian Space Agency, RFBR, ESO Telescopes, UK Science and Technology Facilities Council
Grant number: DOE DE-FC02-06ER41438, PERG03-GA-2008-226653, 09-02-00166a, ID 081.D-0853
URI: http://wrap.warwick.ac.uk/id/eprint/16970

Data sourced from Thomson Reuters' Web of Knowledge

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