Antonelli 2009 短暴GRB 090426的观测

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Title:		GRB 090426: the farthest short gamma-ray burst?
Authors:		Antonelli, L. A.; D'Avanzo, P.; Perna, R.; Amati, L.; Covino, S.; Cutini, S.; D'Elia, V.; Gallozzi, S.; Grazian, A.; Palazzi, E.; Piranomonte, S.; Rossi, A.; Spiro, S.; Stella, L.; Testa, V.; Chincarini, G.; di Paola, A.; Fiore, F.; Fugazza, D.; Giallongo, E.; Maiorano, E.; Masetti, N.; Pedichini, F.; Salvaterra, R.; Tagliaferri, G.; Vergani, S.
Affiliation:		AA(INAF-Astronomical Observatory of Rome, via Frascati 33, 00040 Monteporzio (Rome), Italy a.antonelli@oa-roma.inaf.it),  )
Publication:		Astronomy and Astrophysics, Volume 507, Issue 3, 2009, pp.L45-L48 (A&A Homepage)
Publication Date:		12/2009
Origin:		EDP Sciences
Keywords:		gamma ray: bursts
DOI:		10.1051/0004-6361/200913062
Bibliographic Code:		2009A&A...507L..45A

Abstract

Aims: With an observed and rest-frame duration of <2 s and <0.5 s, respectively, GRB 090426 could be classified as a short GRB. The prompt detection, both from space and ground-based telescopes, of a bright optical counterpart to this GRB offered a unique opportunity to complete a detailed study.
Methods: Based on an extensive ground-based observational campaign, we obtained the spectrum of the optical afterglow of GRB 090426, measuring its redshift and obtaining information about the medium in which the event took place. We completed follow-up observations of the afterglow optical light curve down to the brightness level of the host galaxy that we firmly identified and studied. We also retrieved and analyzed all the available high-energy data of this event, and compared the results with our findings in the optical. This represents one of the most detailed studies of a short-duration event presented so far.
Results: The time properties qualify GRB 090426 as a short burst. In this case, its redshift of z = 2.61 would be the highest yet found for a GRB of this class. On the other hand, the spectral and energy properties are more similar to those of long bursts. LBT late-time deep imaging identifies a star-forming galaxy at a redshift consistent with that of the GRB. The afterglow lies within the light of its host and shows evidence of local absorption. The results reported in this paper are based on
observations carried out at Telescopio Nazionale Galileo and at Large Binocular Telescope.
Tables 1, 2 and Figs. A.1-A.3 are only available in electronic form at http://www.aanda.org

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