Constraining the energy budget of GRB 080721
. (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 Full text not available from this repository.
Official URL: http://dx.doi.org/10.1111/j.1365-2966.2009.15443.x
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|
|Date:||21 November 2009|
|Number of Pages:||10|
|Page Range:||pp. 90-99|
|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|
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