Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/1336

 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.NilakshiBhattacharya, D.Castro-Tirado, A.J. Issue Date: 1999 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. URI: http://hdl.handle.net/2289/1336 ISSN: 0304-9523 Alternative Location: http://adsabs.harvard.edu/cgi-bin/bib_query?1999BASI...27....3S 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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