BVRcIc photometry of GRB 980703 and GRB 990123 host galaxies
Abstract
We present a photometry of GRB 980703 and GRB 990123 host galaxies which was performed about 20 days and a half year after gamma-ray bursts occured, respectively. The contributions of the optical transiets (OT) were negligible in both cases. We derived broad band BVRcIc spectra of the host galaxies and compared them to continuum spectra of different Hubble-type galaxies and averaged spectra of starburst galaxies. For H0=60 km s-1 Mpc-1 and three Friedmann cosmological models with matter density and cosmological constant parameters (Omegam,OmegaLambda) = (1,0),(0,0),(0,1) we estimated MBrest and star-forming rates (SFRs) using the fluxes in photometric bands for the host galaxies. Within the range of cosmological parameters our estimates of the absolute magnitudes are: MBrest = -20.60 .. -21.73 for the GRB 980703 host galaxy and MBrest = -20.20 .. -21.82 for the GRB 990123 host galaxy. We obtained estimates of K-correction values and absolute magnitudes of the host galaxies using SEDs for star-forming galaxies.
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