BVRI CCD photometric standards in the field of GRB 990123

Details BVRI CCD photometric standards in the field of GRB 990123 BVRI CCD photometric standards in the field of GRB 990123

1999-02-13

arxiv.org/abs/astro-ph/9902197v1

Astronomy and Astrophysics

Astrophysics

Tex file, 5 pages with 1 figure. Bull. Astron. Society India, Vol. 27 (accepted)

Scientific paper

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.

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