Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/1878
 Title: Optical follow up of the GRB 990123 sources from UPSO, Naini Tal Authors: Sagar, RPandey, A. KMohan, VYadav, R. K. SNilakshiBhattacharya, DCastro-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. URI: http://hdl.handle.net/2248/1878 ???metadata.dc.relation.uri???: http://adsabs.harvard.edu/abs/1999BASI...27....3S Appears in Collections: BASI Publications

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