BVRI CCD photometric standards in the field of GRB 990123

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The CCD magnitudes in Johnson $BV$ and Cousins $RI$ photometric passbands are determined for 18 stars in the field of GRB 990123. These measurements can be used in carrying out precise CCD photometry of the optical transient of GRB 990123 using differential photometric techniques during non--photometric sky conditions. A comparison with previous photometry indicates that the present photmetry is more precise.
Tex file, 5 pages with 1 figure. Bull. Astron. Society India, Vol. 27 (accepted)

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Astrophysics

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http://salesiana.dossiersoluciones.com/handle/123456789/13819

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/astro-ph/9902197
 http://arxiv.org/abs/astro-ph/9902197

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arXiv