Multicolor observations of the afterglow of the short/hard GRB 050724

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...

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Autores principales: 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.
Formato: JOUR
Materias:
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
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00046361_v473_n1_p77_Malesani
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_00046361_v473_n1_p77_Malesani2023-10-03T14:00:20Z Multicolor observations of the afterglow of the short/hard GRB 050724 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. 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 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00046361_v473_n1_p77_Malesani
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic 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
spellingShingle 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
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.
Multicolor observations of the afterglow of the short/hard GRB 050724
topic_facet 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
description 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.
format JOUR
author 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.
author_facet 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.
author_sort Malesani, D.
title Multicolor observations of the afterglow of the short/hard GRB 050724
title_short Multicolor observations of the afterglow of the short/hard GRB 050724
title_full Multicolor observations of the afterglow of the short/hard GRB 050724
title_fullStr Multicolor observations of the afterglow of the short/hard GRB 050724
title_full_unstemmed Multicolor observations of the afterglow of the short/hard GRB 050724
title_sort multicolor observations of the afterglow of the short/hard grb 050724
url http://hdl.handle.net/20.500.12110/paper_00046361_v473_n1_p77_Malesani
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