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Title: Optical follow up of the GRB 990123 sources from UPSO, Naini Tal
Authors: Sagar, R
Pandey, A. K
Mohan, V
Yadav, R. K. S
Bhattacharya, D
Castro-Tirado, A. J
Keywords: CCD magnitudes;GRB 990123;Photometry;Gamma-ray
Issue Date: 1999
Publisher: Astronomical Society of India
Citation: BASI, Vol. 27, No. 1, pp. 3 - 7
Abstract: 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.
Appears in Collections:BASI Publications

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