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|Title:||Optical follow up of the GRB 990123 sources from UPSO, Naini Tal|
|Publisher:||The Astronomical Society of India|
|Citation:||Bulletin of the Astronomical Society of India, 1999, Vol.27, p3-7|
|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.|
|Copyright:||(1999) by the Astronomical Society of India. Scanned images provided by the NASA ADS Data System.|
|Appears in Collections:||Research Papers (A&A)|
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