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Position and parallax of the big γ-ray burst of 8 May 1997

Taylor, G. B. and Frail, D. A. and Beasley, A. J. and Kulkarni, S. R. (1997) Position and parallax of the big γ-ray burst of 8 May 1997. Nature, 389 (6648). pp. 263-265. ISSN 0028-0836. doi:10.1038/38456.

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γ-ray bursts (GRBs) have puzzled astronomers for almost three decades, primarily owing to the lack of identifications at other wavelengths. The detection of a radio counterpart enables application of the powerful technique of very long baseline interferometry (VLBI) to this intriguing class of objects. Here we present VLBI monitoring of VLA J065349.4 + 791619 obtained between 8 and 25 days after the initial γ-ray burst. The radio emission is found to be very compact, with an angular extent of less than 1 milliarcsecond. We derive a position for the radio counterpart accurate to 200 microarcseconds, and constrain the proper motion of VLA J065349.4 + 791619 be less than 50 milliarcseconds per year. We place an upper limit on the annual parallax of 1 milliarcsecond. These results are entirely consistent with the expectations of cosmological models.

Item Type:Article
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URLURL TypeDescription DOIArticle
Taylor, G. B.0000-0001-6495-7731
Kulkarni, S. R.0000-0001-5390-8563
Additional Information:© 1997 Macmillan Publishers Ltd. Received 8 August; accepted 28 August 1997. The VLA and VLBA are facilities of the NSF operated under cooperative agreement by Associated Universities, Inc. We thank the VLBA, VLA and Effelsberg operational staff, and the VLBA correlator staff, for their extraordinary efforts on behalf of this project. S.R.K. is supported by the NSF and NASA.
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Issue or Number:6648
Record Number:CaltechAUTHORS:20150608-091113410
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:58074
Deposited By: Tony Diaz
Deposited On:08 Jun 2015 18:18
Last Modified:10 Nov 2021 21:58

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