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A multi-colour study of the dark GRB 000210 host galaxy and its environment

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journal contribution
posted on 24.10.2012, 09:05 by J. Gorosabel, L. Christensen, J. Hjorth, J. U. Fynbo, H. Pedersen, B. L. Jensen, M. I. Andersen, N. Lund, A. O. Jaunsen, J. M. C. Ceron, A. J. Castro-Tirado, A. Fruchter, J. Greiner, E. Pian, P. M. Vreeswijk, I. Burud, F. Frontera, L. Kaper, S. Klose, C. Kouveliotou, N. Masetti, E. Palazzi, J. Rhoads, E. Rol, I. Salamanca, N. Tanvir, R. A. M. J. Wijers, van den Heuvel E.
We present UBVRIZJs HKs broad band photometry of the host galaxy of the dark gamma-ray burst (GRB) of February 10, 2000. These observations represent the most exhaustive photometry given to date of any GRB host galaxy. A grid of spectral templates have been fitted to the Spectral Energy Distribution (SED) of the host. The derived photometric redshift is z=0.842+0.054-0.042, which is in excellent agreement with the spectroscopic redshift ( $z=0.8463\pm 0.0002$) proposed by Piro et al. (2002) based on a single emission line. Furthermore, we have determined the photometric redshift of all the galaxies in an area of $6^{\prime} \times 6^{\prime}$ around the host galaxy, in order to check for their overdensity in the environment of the host. We find that the GRB 000210 host galaxy is a subluminous galaxy ( $L \sim 0.5 \pm 0.2 \ L^{\star}$ ), with no companions above our detection threshold of $0.18 \pm 0.06 \ L^{\star}$. Based on the restframe ultraviolet flux a star formation rate of $2.1 \pm 0.2 \ M_{\odot}$ yr -1 is estimated. The best fit to the SED is obtained for a starburst template with an age of 0.181+0.037-0.026 Gyr and a very low extinction ( $A_{\rm V} \sim 0$). We discuss the implications of the inferred low value of $A_{\rm V}$ and the age of the dominant stellar population for the non-detection of the GRB 000210 optical afterglow.



Astronomy & Astrophysics, 2003, 400 (1), pp. 127-136


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