GCN Circular 7771
D. Malesani (DARK), P. Jakobsson (Univ. Hertfordshire), J. P. U. Fynbo, J. Hjorth, B. Milvang-Jensen (DARK), report on behalf of a larger collaboration: We further inspected our images and spectra (Jakobsson et al., GCN 7757) of the afterglow of GRB 080520 (Grupe et al., GCN 7753). A faint extension is visible in our images (seeing 0.7") underlying the afterglow emission, which may be due to a relatively bright host galaxy. This is consistent with the 2D trace of the spectrum, which reveals the proposed [O II] line to be also spatially extended. Using the relations by Kennicutt (1998, ARA&A, 36, 189), the flux of the [O II] line (not corrected for extinction) corresponds to a star formation rate (SFR) of approximately 15 M_Sun/yr.