Table 1: Log of the observations. For the NOT and CAHA the observation are cycles of 4 images, ( $4 \times T_{\rm exp}$) with the plate rotator at 0, 22.5, 45, 67.5 degrees. The R-band magnitudes are calibrated using the standard stars given by Hicken et al. (2006).
Days from GRB Telescope Exposure Time Seeing Magnitude P $\theta $
t-t0 (+Instrument) s '' R-band % degrees
2.569954 - 2.597558 0.7 m AZT-8(+ST-7) $2 \times (10\times 90)$ 3.0 $17.99\pm 0.03$ $2.61\pm1.80$ $157.82\pm 16.47$
3.579178 - 3.600764 0.7 m AZT-8(+ST-7) $2 \times (10\times 90)$ 3.8 $17.88\pm 0.02$ $4.53\pm1.52$ $143.64\pm 7.18$
4.555046 - 4.599144 0.7 m AZT-8(+ST-7) $2 \times (20\times 90)$ 3.3 $17.68\pm 0.02$ $4.06\pm1.63$ $143.86\pm 7.98$
5.565510 - 5.612326 0.7 m AZT-8(+ST-7) $2 \times (20\times 90)$ 4.2 $17.52\pm 0.02$ $2.43\pm0.89$ $150.09\pm 10.02$
2.569954 - 5.612326 0.7 m AZT-8(+ST-7) $2 \times (60\times 90)$ 3.5 $17.71\pm 0.02$ $3.40\pm1.09$ $147.56\pm 7.06^{\star}$
13.721516 - 13.755185 2.5 m NOT(+ALFOSC) $4 \times 700$ 1.0 $17.19 \pm 0.04$ $1.44\pm0.14$ $49.58\pm 2.73$
18.673955 - 18.719135 2.2 m CAHA(+CAFOS) $4 \times 900$ 1.6 $17.38 \pm 0.03$ $1.40\pm0.21$ $51.62\pm 4.11$
38.679248 - 38.707514 2.2 m CAHA(+CAFOS) $4 \times 400$ 2.0 $18.44 \pm 0.03$ < $3.9^{\dagger}$ -

$^{\star}$ Determined combining the images of the above four observing epochs. $^{\dagger}$ 3 $\sigma$ upper limit.


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