University of Leicester
Browse
- No file added yet -

Detection of the high z GRB 080913 and its implications on progenitors and energy extraction mechanisms

Download (626.88 kB)
journal contribution
posted on 2012-10-24, 09:06 authored by D. Perez-Ramirez, de Ugarte Postigo A, J. Gorosabel, M. A. Aloy, G. Johannesson, M. A. Guerrero, J. P. Osborne, K. L. Page, R. S. Warwick, I. Horvath, P. Veres, M. Jelinek, P. Kubanek, S. Guziy, M. Bremer, J. M. Winters, A. Riva, A. J. Castro-Tirado
Aims. We present multiwavelength observations of one of the most distant gamma-ray bursts detected so far, GRB 080913. Based on these observations, we consider whether it could be classified as a short-duration GRB and discuss the implications for the progenitor nature and energy extraction mechanisms. Methods. Multiwavelength X-ray, near IR and millimetre observations were made between 20.7 h and ~16.8 days after the event. Results. Whereas a very faint afterglow was seen at the 3.5m CAHA telescope in the nIR, the X-ray afterglow was clearly detected in both Swift and XMM-Newton observations. An upper limit is reported in the mm range. We have modeled the data assuming a collimated ≳ 3° blast wave with an energy injection at days carrying erg or approximately 12 times the initial energy of the blast wave. We find that GRB 080913 shares many of the gamma-ray diagnostics with the more recent burst GRB 090423 for being classified as short had they ocurred at low redshift. If the progenitor were a compact binary merger, it is likely composed by a NS and BH. The Blandford-Znajek (BZ) mechanism is the preferred one to extract energy from the central, maximally-rotating BH. Both the magnetic field close to the event horizon (B) and the BH mass () are restricted within a relatively narrow range, such that . Similar constraints on the central BH hold for collapsar-like progenitor systems if the BZ-mechanism works for the system at hand.

History

Citation

Astronomy & Astrophysics, 2010, 510

Version

  • VoR (Version of Record)

Published in

Astronomy & Astrophysics

Publisher

EDP Sciences for European Southern Observatory (ESO)

issn

0004-6361

Copyright date

2009

Available date

2012-10-24

Publisher version

http://www.aanda.org/articles/aa/abs/2010/02/aa11151-08/aa11151-08.html

Language

English