Grupo de Sistemas Estelares

Fynbo, J. P. U., Gorosabel, J., Jensen, B. L., Pedersen, H., Hjorth, J., Andersen, M. I., Kaas, A. A., Abbott, T., dall, T. H., and Oestensen, R.
GRB Coordinates Network, 975, 1 (2001)
12/2001

ABSTRACT

 
"Using the ALFOSC on the 2.5m Nordic Optical Telescope, we have obtained R-band imaging of the optical counterpart of GRB 010222 (GCN #961, GCN #963). We have derived the following preliminary magnitudes;

  Date, Feb 2001(UT)              R               Texp(s)
  =========================================
    23.008--23.012         19.56+-0.03           300
    23.015--23.019         19.53+-0.03           300
    23.020--23.023         19.56+-0.03           300
    23.083--23.086         19.65+-0.03           300
    23.087--23.091         19.68+-0.03           300
    23.145--23.148         19.76+-0.03           300
    23.165--23.167         19.79+-0.05           100

Our zero-point is based on the the reference star 'A' of McDowell et al. (GCN #963). We have fitted a power-law light curve to the magnitudes reported by  Stanek et al. (GCN #970) and to the ones displayed above. We obtain a value for the slope of 0.86+-0.01 (chi^2/dof= 12.7/8=1.6), which is consistent with the one reported by Price et al. (GCN #973)"