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          Institute: MPI für Radioastronomie     Collection: Publikationen des MPI für Radioastronomie     Display Documents

ID: 125422.0, MPI für Radioastronomie / Publikationen des MPI für Radioastronomie
Millimeter observations of GRB 030329 : continued evidence for a two-component jet
Authors:Sheth, K.; Frail, D. A.; White, S.; Das, M.; Bertoldi, F.; Walter, F.; Kulkarni, S. R.; Berger, E.
Date of Publication (YYYY-MM-DD):2003-09-20
Title of Journal:Astrophysical Journal
Journal Abbrev.:Astrophys. J.
Issue / Number:1
Start Page:L33
End Page:L36
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We present the results of a dedicated campaign on the afterglow of GRB 030329 with the millimeter interferometers of the Owens Valley Radio Observatory (OVRO) and the Berkeley-Illinois-Maryland Association (BIMA), and with the MAMBO-2 bolometer array on the IRAM 30 m telescope. These observations allow us to trace the full evolution of the afterglow of GRB 030329 at frequencies of 100 and 250 GHz for the first time. The millimeter light curves exhibit two main features: a bright, constant flux density portion and a steep powerlaw decline. The absence of bright, short-lived millimeter emission is used to show that the GRB central engine was not actively injecting energy well after the burst. The millimeter data support a model, advocated by Berger et al., of a two-component jetlike outflow in which a narrow-angle jet is responsible for the high-energy emission and early optical afterglow, and a wide-angle jet carrying most of the energy is powering the radio and late optical afterglow emission.
Free Keywords:cosmology : observations, gamma rays : bursts, radio continuum : general
Comment of the Author/Creator:Date: 2003, SEP 20
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Radioastronomie
External Affiliations:CALTECH, Div Math & Phys Sci, Pasadena, CA 91125 USA.; Natl Radio Astron Observ, Socorro, NM 87801 USA.; Univ Maryland, Dept Astron, College Pk, MD 20742 USA.; Max Planck Inst Radioastron, D-53121 Bonn, Germany.
Identifiers:ISI:000185338500009 [ID No:1]
ISSN:0004-637X [ID No:2]
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