Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: VLA and MERLIN monitoring observations of the gravitational lens system
  B1030+074   We present VLA and MERLIN monitoring data of the JVAS gravitational lens
system B1030+074. The system was monitored with the VLA from February 1998 to
October 1998 at 8.4-GHz during which the VLA was at its A, BnA and B
configuration. The 47 epochs of observations have an average spacing of
approximately 5 days. Ten MERLIN snapshots were obtained in the L-band (1.7
GHz) during the months of April, May and June 1998. Preliminary light curves of
the two components of the lens system obtained from the VLA data indicate that
during the period of the monitoring the A flux density showed a steady
decrease. No changes are observed in the B light curve.

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The categories of this paper are: quant-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: funct-an
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The categories of this paper are: gr-qc
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The categories of this paper are: cond-mat
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The categories of this paper are: math-ph
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The categories of this paper are: hep-th
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The categories of this paper are: ao-sci
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: hep-ex
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The categories of this paper are: q-fin
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The categories of this paper are: bayes-an
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The categories of this paper are: eess
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The categories of this paper are: plasm-ph