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dc.contributor.author
Malesani, D.
dc.contributor.author
Covino, S.
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D'Avanzo, P.
dc.contributor.author
D'Elia, V.
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Fugazza, D.
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Piranomonte, S.
dc.contributor.author
Ballo, L.
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Campana, S.
dc.contributor.author
Stella, L.
dc.contributor.author
Tagliaferri, G.
dc.contributor.author
Antonelli, L. A.
dc.contributor.author
Chincarini, G.
dc.contributor.author
Della Valle, M.
dc.contributor.author
Goldoni, P.
dc.contributor.author
Guidorzi, C.
dc.contributor.author
Israel, G. L.
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Lazzati, D.
dc.contributor.author
Melandri, A.
dc.contributor.author
Pellizza González, Leonardo Javier
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Romano, P.
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Stratta, G.
dc.contributor.author
Vergani, S. D.
dc.date.available
2017-07-24T19:45:42Z
dc.date.issued
2007-10
dc.identifier.citation
Malesani, D.; Covino, S.; D'Avanzo, P.; D'Elia, V.; Fugazza, D.; et al.; Multicolor observations of the afterglow of the short/hard GRB 050724; EDP Sciences; Astronomy and Astrophysics; 473; 1; 10-2007; 77-84
dc.identifier.issn
0004-6361
dc.identifier.uri
http://hdl.handle.net/11336/21213
dc.description.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.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
EDP Sciences
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Gamma Rays. Bursts
dc.subject
Galaxies: Fundamental Parameters
dc.subject.classification
Astronomía
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Ciencias Físicas
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
Multicolor observations of the afterglow of the short/hard GRB 050724
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-07-18T14:52:12Z
dc.journal.volume
473
dc.journal.number
1
dc.journal.pagination
77-84
dc.journal.pais
Francia
dc.journal.ciudad
Les Ulis
dc.description.fil
Fil: Malesani, D.. Universidad de Copenhagen; Dinamarca
dc.description.fil
Fil: Covino, S.. Osservatorio Astronomico di Brera; Italia
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Fil: D'Avanzo, P.. Osservatorio Astronomico di Brera; Italia
dc.description.fil
Fil: D'Elia, V.. Osservatorio Astronomico di Roma; Italia
dc.description.fil
Fil: Fugazza, D.. Osservatorio Astronomico di Brera; Italia
dc.description.fil
Fil: Piranomonte, S.. Osservatorio Astronomico di Roma; Italia
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Fil: Ballo, L.. European Space Agency; España
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Fil: Campana, S.. Osservatorio Astronomico di Brera,; Italia
dc.description.fil
Fil: Stella, L.. Osservatorio Astronomico di Roma; Italia
dc.description.fil
Fil: Tagliaferri, G.. Osservatorio Astronomico di Brera; Italia
dc.description.fil
Fil: Antonelli, L. A.. Osservatorio Astronomico di Roma; Italia
dc.description.fil
Fil: Chincarini, G.. Osservatorio Astronomico di Brera; Italia
dc.description.fil
Fil: Della Valle, M.. Osservatorio Astrofisico di Arcetri; Italia
dc.description.fil
Fil: Goldoni, P.. Laboratoire Astroparticule et Cosmologie; Francia
dc.description.fil
Fil: Guidorzi, C.. Osservatorio Astronomico di Brera; Italia
dc.description.fil
Fil: Israel, G. L.. Osservatorio Astronomico di Roma; Italia
dc.description.fil
Fil: Lazzati, D.. State University Of Colorado Boulder; Estados Unidos
dc.description.fil
Fil: Melandri, A.. Osservatorio Astronomico di Roma; Italia
dc.description.fil
Fil: Pellizza González, Leonardo Javier. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
dc.description.fil
Fil: Romano, P.. Osservatorio Astronomico di Brera; Italia
dc.description.fil
Fil: Stratta, G.. Science Data Center; Italia
dc.description.fil
Fil: Vergani, S. D.. Dublin City University; Irlanda
dc.journal.title
Astronomy and Astrophysics
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1051/0004-6361:20077868
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/abs/2007/37/aa7868-07/aa7868-07.html
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://arxiv.org/abs/0706.1273
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