Left: zoom-in of the GROND combined g′r′i′z′-band image obtained 1.74 days after the burst at a seeing of 15. It shows the afterglow (AG) and the brightest galaxies close to it. Right: zoom-in of the stacked GROND optical g′r′i′z′-band images obtained on May 15, 2009, 6.5 months after the burst (5th epoch) when the afterglow had faded away. It also shows the galaxy (G3) that was coincidentally covered by the slit of the spectrograph when the redshift of the afterglow was measured with the ESO/VLT (Vreeswijk et al. 2008; Fynbo et al. 2009). Data for G1 to G3 are summarized in Table 6.