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Millimeter Observations of GRB 030329: Continued Evidence for a Two-Component Jet

Sheth, Kartik and Frail, Dale A. and White, Stephen and Das, Mousumi and Bertoldi, Frank and Walter, Fabian and Kulkarni, Shri R. and Berger, Edo (2003) Millimeter Observations of GRB 030329: Continued Evidence for a Two-Component Jet. Astrophysical Journal, 595 (1). L33-L36. ISSN 0004-637X. doi:10.1086/378933.

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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 power-law 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.

Item Type:Article
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URLURL TypeDescription Paper
Sheth, Kartik0000-0002-5496-4118
Bertoldi, Frank0000-0002-1707-1775
Walter, Fabian0000-0003-4793-7880
Kulkarni, Shri R.0000-0001-5390-8563
Berger, Edo0000-0002-9392-9681
Additional Information:© 2003. The American Astronomical Society. Received 2003 July 3; accepted 2003 August 7; published 2003 August 21. GRB research at Caltech is supported by grants from NASA and the National Science Foundation. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. D. A. F. thanks the Astronomical Institute at the University of Amsterdam for their hospitality during the time when this Letter was written. Research at the OVRO is partially funded by NSF grant AST-9981546 and at BIMA by NSF grant AST-9981289. We acknowledge the support of R. Zylka and A. Weiss in observations with the IRAM 30 m telescope, which is supported by INSU/CNRS (France), MPG (Germany), and IGN (Spain).
Funding AgencyGrant Number
Institut national des sciences de l'Univers (INSU)UNSPECIFIED
Centre National de la Recherche Scientifique (CNRS)UNSPECIFIED
Max Planck GesellschaftUNSPECIFIED
Instituto Geográfico Nacional (IGN)UNSPECIFIED
Subject Keywords:cosmology: observations; gamma rays: bursts; radio continuum: general
Issue or Number:1
Record Number:CaltechAUTHORS:20170408-161356786
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Official Citation:Kartik Sheth et al 2003 ApJ 595 L33
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:76151
Deposited By: 1Science Import
Deposited On:10 Jul 2017 22:06
Last Modified:15 Nov 2021 16:57

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