1999/02/13 by R. Sagar, A. K. Pandey, Sagar, R. +11
Engineering · Physics and Astronomy · #Astronomy and Astrophysical Research #CCD and CMOS Imaging Sensors #Gamma-ray bursts and supernovae #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/9902196
LaTex file, 5 pages with 1 figure. Bull. Astron. Society India, Vol. 27 (accepted)
arxiv created 1999/02/17 · arxiv updated 2009/12/01
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± 0.06. Such decay is quite consistent with the fireball models for the optical transient.