Optical follow up of the GRB 990123 source from UPSO, Nainital

Details Optical follow up of the GRB 990123 source from UPSO, Nainital Optical follow up of the GRB 990123 source from UPSO, Nainital

1999-02-13

arxiv.org/abs/astro-ph/9902196v2

Astronomy and Astrophysics

Astrophysics

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

Scientific paper

The CCD magnitudes in Johnson $BV$ and Cousins $R$ photometric passbands are determined for the optical transient of GRB 990123. These observations have been taken approximately 12 hours after trigger of the gamma-ray burst. BVR photometric light curves are obtained by combining the published data with the present measurements. They indicate that the flux decay constants in $BV$ and $R$ passbands are almost the same. Its value is $1.1\pm 0.06$. Such decay is quite consistent with the fireball models for the optical transient.

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