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Aims: We present multiwavelength observations of one of the most distantgamma-ray bursts detected so far, GRB 080913. Based on these observations, weconsider whether it could be classified as a short-duration GRB and discuss theimplications for the progenitor nature and energy extraction mechanisms.  Methods: Multiwavelength X-ray, near IR and millimetre observations were madebetween 20.7 hours and 16.8 days after the event.  Results: Whereas a very faint afterglow was seen at the 3.5m CAHA telescopein the nIR, the X-ray afterglow was clearly detected in both Swift andXMM-Newton observations. An upper limit is reported in the mm range. We havemodeled the data assuming a collimated $\theta_0$ $\gtrsim$ 3$^\circ$ blastwave with an energy injection at 0.5 days carrying $5\sim 10^{52}$ erg orapproximately 12 times the initial energy of the blast wave. We find that GRB080913 shares many of the gamma-ray diagnostics with the more recent burst GRB090423 for being classified as short had they ocurred at low redshift. If theprogenitor 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 fromthe central, maximally-rotating BH. Both the magnetic field close to the eventhorizon (B) and the BH mass ($M_{bh}$) are restricted within a relativelynarrow range, such that $(B / 3\times 10^{16} \rm{G}) (M_{bh} / 7 M_\odot) \sim1$. Similar constraints on the central BH hold for collapsar-like progenitorsystems if the BZ-mechanism works for the system at hand.

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