Decay of the GRB 990123 optical afterglow: implications for the fireball model

Castro-Tirado, A J; Zapatero-Osorio, M R; Caon, N; Cairos, L M; Hjorth, J; Pedersen, H; Andersen, M I; Gorosabel, J; Bartolini, C; Guarnieri, A; Piccioni, A; Frontera, F; Masetti, N; Palazzi, E; Pian, E; Greiner, J; Hudec, R; Sagar, R; Pandey, A K; Mohan, V; Yadav, R K; Bjornsson, C; Jakobsson, P; Burud, I; Courbin, F; Valentini, G; Piersimoni, A; Aceituno, J; Montoya, L M; Pedraz, S; Gredel, R; Claver, C F; Rector, T A; Rhoads, J E; Walter, F; Ott, J; Hippelein, H; Sàsnchez-Bèjar, V; Gutiérrez, C; Wei, J; Zhou, A; Guziy, S; Shlyapnikov, A; Heise, J; Costa, E; Feroci, M; Piro, L

Castro-Tirado, A J; Zapatero-Osorio, M R; Caon, N; Cairos, L M; Hjorth, J; Pedersen, H; Andersen, M I; Gorosabel, J; Bartolini, C; Guarnieri, A; Piccioni, A; Frontera, F; Masetti, N; Palazzi, E; Pian, E; Greiner, J; Hudec, R; Sagar, R; Pandey, A K; Mohan, V; Yadav, R K; Bjornsson, C; Jakobsson, P; Burud, I; Courbin, F; Valentini, G; Piersimoni, A; Aceituno, J; Montoya, L M; Pedraz, S; Gredel, R; Claver, C F; Rector, T A; Rhoads, J E; Walter, F; Ott, J; Hippelein, H; Sàsnchez-Bèjar, V; Gutiérrez, C; Wei, J; Zhou, A; Guziy, S; Shlyapnikov, A; Heise, J; Costa, E; Feroci, M; Piro, L.

Afiliación

Castro-Tirado AJ; Instituto de Astrofisica de Andalucia, IAA-CSIC, Granada, Spain. Instituto de Astrofisica de Canarias, La Laguna, Tenerife, Spain. Astronomical Observatory, University of Copenhagen, Copenhagen, Denmark. Nordic Optical Telescope, La Palma, T.

Science ; 283(5410): 2069-73, 1999 03 26.

Article en En | MEDLINE | ID: mdl-10092226

RESUMEN

Broad-band (ultraviolet to near-infrared) observations of the intense gamma ray burst GRB 990123 started approximately 8.5 hours after the event and continued until 18 February 1999. When combined with other data, in particular from the Robotic Telescope and Transient Source Experiment (ROTSE) and the Hubble Space Telescope (HST), evidence emerges for a smoothly declining light curve, suggesting some color dependence that could be related to a cooling break passing the ultraviolet-optical band at about 1 day after the high-energy event. The steeper decline rate seen after 1.5 to 2 days may be evidence for a collimated jet pointing toward the observer.

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Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Science Año: 1999 Tipo del documento: Article Pais de publicación: Estados Unidos

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Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Science Año: 1999 Tipo del documento: Article Pais de publicación: Estados Unidos