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Malesani, D.; Covino, S.; D'Avanzo, P.; D'Elia, V.; Fugazza, D.; Piranomonte, S.; Bailo, L.; Campana, S.; Stella, L.; Tagliaferri, G.; Antonelli, L.A.; Chincarini, G.; Della Valle, M.; Goldoni, P.; Guidorzi, C.; Israel, G.L.; Lazzati, D.; Melandri, A. (...) Vergani, S.D. "Multicolor observations of the afterglow of the short/hard GRB 050724" (2007) Astronomy and Astrophysics. 473(1):77-84
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Abstract:

Context. New information on short/hard gamma-ray bursts (GRBs) is being gathered thanks to the discovery of their optical and X-ray afterglows. However, some key aspects are still poorly understood, including the collimation level of the outflow, the duration of the central engine activity, and the properties of the progenitor systems. Aims. We want to constrain the physical properties of the short GRB 050724 and of its host galaxy, and make some inferences on the global short GRB population. Methods. We present optical observations of the afterglow of GRB 050724 and of its host galaxy, significantly expanding the existing dataset for this event. We compare our results with models, complementing them with available measurements from the literature. We study the afterglow light curve and spectrum including X-ray data. We also present observations of the host galaxy. Results. The observed optical emission was likely related to the large flare observed in the X-ray light curve. The apparent steep decay was therefore not due to the jet effect. Available data are indeed consistent with low collimation, in turn implying a large energy release, comparable to that of long GRBs. The flare properties also constrain the internal shock mechanism, requiring a large Lorentz factor contrast between the colliding shells. This implies that the central engine was active at late times, rather than ejecting all shells simultaneously. The host galaxy has red colors and no ongoing star formation, consistent with previous findings on this GRB. However, it is not a pure elliptical, and has some faint spiral structure. Conclusions. GRB 050724 provides the most compelling case for association between a short burst and a galaxy with old stellar population. It thus plays a pivotal role in constraining progenitors models, which should allow for long delays between birth and explosion. © ESO 2007.

Registro:

Documento: Artículo
Título:Multicolor observations of the afterglow of the short/hard GRB 050724
Autor:Malesani, D.; Covino, S.; D'Avanzo, P.; D'Elia, V.; Fugazza, D.; Piranomonte, S.; Bailo, L.; Campana, S.; Stella, L.; Tagliaferri, G.; Antonelli, L.A.; Chincarini, G.; Della Valle, M.; Goldoni, P.; Guidorzi, C.; Israel, G.L.; Lazzati, D.; Melandri, A.; Pellizza, L.J.; Romano, P.; Stratta, G.; Vergani, S.D.
Filiación:Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries vej 30, 2100 København Ø, Denmark
INAF, Osservatorio Astronomico di Brera, via E. Bianchi 46, 23807 Merate (LC), Italy
Università dell'Insubria, Dipartimento di Fisica e Matematica, via Valleggio 11, 22100 Como, Italy
INAF, Osservatorio Astronomico di Roma, via Frascati 33, 00040 Monteporzio Catone (Roma), Italy
Università Degli Studi di Milano-Bicocca, Dipartimento di Fisica, piazza delle Scienze 3, 20126 Milano, Italy
European Space Astronomy Centre, European Space Agency (ESA), Box 78, 28691 Villanueva de la Cañada, Madrid, Spain
ASI Science Data Center, via G. Galilei, 00044 Frascati (Roma), Italy
INAF, Osservatorio Astrofisico di Arcetri, largo E. Fermi 5, 50125 Firenze, Italy
Kavli Institute for Theoretical Physics, University of California, Santa Barbara, CA 93106, United States
Laboratoire Astroparticule et Cosmologie, 10 rue A. Domon et L. Duquet, 75205 Paris Cedex 13, France
Service d'Astrophysique, DSM/DAPNIA/SAp, CEA-Saclay, 91191 Gif-sur-Yvette, France
JILA, University of Colorado, Boulder, CO 80309-0440, United States
Astrophysics Research Institute, Liverpool JMU, Twelve Quays House, Egerton Wharfs, Birkenhead CH41 1LD, United Kingdom
Instituto de Astronomía y Física Del Espacio (CONICET/UBA), Casilla de Correos 67, Suc. 28, (1428) Buenos Aires, Argentina
Dunsink Observatory, DIAS, Dunsink lane, Dublin 15, Ireland
School of Physical Sciences, NCPST, Dublin City University, Dublin 9, Ireland
Palabras clave:Galaxies: fundamental parameters; Gamma rays: bursts; Galaxies; Light emission; Lorentz force; Stars; X rays; Faint spiral structures; Light curves; Low collimation; Stellar population; Gamma rays
Año:2007
Volumen:473
Número:1
Página de inicio:77
Página de fin:84
DOI: http://dx.doi.org/10.1051/0004-6361:20077868
Título revista:Astronomy and Astrophysics
Título revista abreviado:Astron. Astrophys.
ISSN:00046361
CODEN:AAEJA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v473_n1_p77_Malesani

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Citas:

---------- APA ----------
Malesani, D., Covino, S., D'Avanzo, P., D'Elia, V., Fugazza, D., Piranomonte, S., Bailo, L.,..., Vergani, S.D. (2007) . Multicolor observations of the afterglow of the short/hard GRB 050724. Astronomy and Astrophysics, 473(1), 77-84.
http://dx.doi.org/10.1051/0004-6361:20077868
---------- CHICAGO ----------
Malesani, D., Covino, S., D'Avanzo, P., D'Elia, V., Fugazza, D., Piranomonte, S., et al. "Multicolor observations of the afterglow of the short/hard GRB 050724" . Astronomy and Astrophysics 473, no. 1 (2007) : 77-84.
http://dx.doi.org/10.1051/0004-6361:20077868
---------- MLA ----------
Malesani, D., Covino, S., D'Avanzo, P., D'Elia, V., Fugazza, D., Piranomonte, S., et al. "Multicolor observations of the afterglow of the short/hard GRB 050724" . Astronomy and Astrophysics, vol. 473, no. 1, 2007, pp. 77-84.
http://dx.doi.org/10.1051/0004-6361:20077868
---------- VANCOUVER ----------
Malesani, D., Covino, S., D'Avanzo, P., D'Elia, V., Fugazza, D., Piranomonte, S., et al. Multicolor observations of the afterglow of the short/hard GRB 050724. Astron. Astrophys. 2007;473(1):77-84.
http://dx.doi.org/10.1051/0004-6361:20077868