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|Title:||Constraining the energy budget of GRB 080721|
|Authors:||Starling, R. L. C.|
Page, K. L.
Tanvir, N. R.
O'Brien, P. T.
Osborne, J. P.
Van Der Horst A. J.
De Ugarte Postigo A.
Fynbo, J. P. U.
Curran, P. A.
Levan, A. J.
Howarth, I. D.
|Publisher:||Oxford University Press (OUP)|
|Citation:||Monthly Notices of the Royal Astronomical Society, 2009, 400 (1), pp. 90-99|
|Abstract:||We follow the bright, highly energetic afterglow of Swift-discovered GRB 080721 at z= 2.591 out to 36 d or 3 × 106 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 Graphic and setting tight constraints on the total energy budget of the burst of Eγ≥ 9.9 × 1051 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.|
|Rights:||This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2009 the authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. Deposited with reference to the publisher’s archiving policy available on the SHERPA/RoMEO website.|
|Appears in Collections:||Published Articles, Dept. of Physics and Astronomy|
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