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

D. Pérez-Ramírez, A. De Ugarte Postigo, J. Gorosabel, M. A. Aloy, G. Jóhannesson, M. A. Guerrero, J. P. Osborne, K. L. Page, R. S. Warwick, I. Horváth, P. Veres, M. Jelínek, P. Kubánek, S. Guziy, M. Bremer, J. M. Winters, A. Riva, A. J. Castro-Tirado

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13 Citations (Scopus)


Aims: We 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.

Original languageEnglish
Article numberA105
JournalAstronomy and Astrophysics
Issue number1
Publication statusPublished - Dec 1 2010


  • Cosmology: observations
  • Stars: gamma-ray bursts: individual: GRB 080913
  • Techniques: photometric

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Pérez-Ramírez, D., De Ugarte Postigo, A., Gorosabel, J., Aloy, M. A., Jóhannesson, G., Guerrero, M. A., Osborne, J. P., Page, K. L., Warwick, R. S., Horváth, I., Veres, P., Jelínek, M., Kubánek, P., Guziy, S., Bremer, M., Winters, J. M., Riva, A., & Castro-Tirado, A. J. (2010). Detection of the high z GRB 080913 and its implications on progenitors and energy extraction mechanisms. Astronomy and Astrophysics, 510(1), [A105].