Perez-Ramirez 2008 high-z GRB 080913 observation

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Title:		Detection of the ultra-high z short GRB 080913 and its implications on progenitors and energy extraction mechanisms
Authors:		Perez-Ramirez, D.; de Ugarte Postigo, A.; Gorosabel, J.; Aloy, M. A.; Guerrero, M. A.; Osborne, J. P.; Page, K. L.; Warwick, R. S.; Horvath, I.; Veres, P.; Jelinek, M.; Kubanek, P.; Guziy, S.; Bremer, M.; Winters, J. M.; Castro-Tirado, A. J.
Publication:		eprint arXiv:0810.2107
Publication Date:		10/2008
Origin:		ARXIV
Keywords:		Astrophysics
Comment:		Letter to the Editor. 4 pages, 4 figures. Submitted to A&A
Bibliographic Code:		2008arXiv0810.2107P

Abstract

Aims: We present multiwavelength observations of the most distant (z~6.7) gamma-ray burst detected so far (GRB 080913) and study whether it can be considered a short- or an intermediate-duration GRB and the implications for the progenitor nature and energy extraction mechanisms. Methods: Multiwavelength (X-ray/nIR/millimetre) observations were taken between 20.7 hours and ~4.5 days after the event. Results: A very faint afterglow is barely seen at the 3.5m CAHA telescope in the nIR, being clearly detected on our XMM-Newton observations. An upper limit is reported in the mm range. GRB 080913 is located in the locus of short-duration GRBs on a hardness-duration diagram, thus strengthening its membership in this class. We also report that GRB 080913 shows lower isotropic luminosities than GRB 060121, another likely member of the class at z~4.6. Regarding the nature of the progenitor, we find that a NS+BH is slightly preferred over a double NS merger, with the Blandford-Znajek process operating in this subclass of extremely energetic short GRBs.

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