G. Leloudas, D. Malesani, D. Xu, J.P.U. Fynbo (DARK/NBI), P.
Jakobsson (Univ. Iceland),
M. E. Brown (Caltech), E.L. Schaller (Univ. Hawaii) and T. Liimets
(NOT & Tartu Obs.)
report on behalf of a larger collaboration:
We observed the field of GRB 090529 (Sakamoto et al., GCN 9430) with
the Nordic Optical Telescope equipped with MOSCA.
3x600s R-band frames were obtained starting on May 30, 21:22 UT, 1.29
days after the GRB.
The optical afterglow (Xin et al., GCN 9431; Schady et al., GCN 9435)
is well detected in our images. Using the same reference star as in
Kann et al. (GCN 9436), we obtain R=22.5 for the afterglow.
Comparison with the measurement by Kann et al., taken 0.3 days after
the GRB, provides a decay index alpha = 0.72, assuming a power-law F
(t) propto t^-alpha.