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We report 139 photometric observations through the B, V, and I filters of thesupernova SN 1998bw, an object which is associated with the Gamma-Ray Burst GRB980425. Detailed light curves of this unique supernova can be compared totheoretical models, so we report here our light curve for 123 days between 27June 1998 and 28 October 1998. The light curve of SN 1988bw is consistent withthose of the Type Ic class. We find that the magnitude-versus-time relation forthis supernova is linear to within 0.05 mags in all colors over the entireduration of our study. Our measured uniform decline rates are $0.0141 \pm0.0002$, $0.0184 \pm 0.0003$, and $0.0181 \pm 0.0003$ magnitudes per day in theB, V, and I bands. The linear decline and the rate of that decline suggest thatlate time light curve is powered by the radioactive decay of cobalt with someleakage of the gamma rays.Comment: 15 pages, 1 figure, 1 table, Accepted for publication in PAS

The Late‐Time Light Curve of SN 1998bw Associated with GRB 980425