Multiband optical photometry and bolometric light curve of the Type Ia supernova 2004S

We present BVR_CI_C broad-band CCD photometry of the Type Ia supernova SN 2004S, which appeared in the galaxy MCG-05-16-021, obtained during 2004 February 12 to March 22. We present multiband and bolometric light curves constructed using our data as well as other available data. The time of the B-band maximum and the peak magnitudes in different bands are obtained using fits of light-curve and colour templates. We clearly see a strong shoulder in the R_C band and a second maximum in the I_C band. SN 2004S closely resembles SN 1992al after maximum. From the peak bolometric luminosity, we estimate the ejected mass of ⁵⁶ Ni to be 0.41 M_solar.