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

AuthorsPérez-Ramírez, Dolores; Ugarte Postigo, Antonio de ; Gorosabel, Javier ; Aloy, M. A.; Jóhannesson, G.; Guerrero, Martín A. ; Osborne, Julian Paul; Page, Kim L.; Warwick, R. S.; Horváth, I.; Veres, Peter; Jelínek, Martin ; Kubánek, Petr ; Guziy, Sergey ; Bremer, M.; Winters, Jan Martin; Riva, Alberto; Castro-Tirado, Alberto J.
Keywordsstars: gamma-ray bursts: individual: GRB 080913
techniques: photometric
Cosmology: observations
Issue Date18-Feb-2010
PublisherEDP Sciences
CitationAstronomy and Astrophysics - 510, A105, 2010
AbstractWe present multiwavelength observations of one of the most distant gamma-ray bursts detected so far, GRB080913. 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 θ0 3◦ blast wave with an energy injection at ∼0.5 days carrying 5 ∼ 1052 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 BHmass (Mbh) are restricted within a relatively narrow range, such that (B/3× 1016 G)(Mbh/7 M ) ∼ 1. Similar constraints on the central BH hold for collapsar-like progenitor systems if the BZ-mechanism works for the system at hand.
Publisher version (URL)http://dx.doi.org/10.1051/0004-6361/200811151
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