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Morales Calder\\'on (5); ((1) Dark Cosmology Centre (NBI) Copenhagen; (2) Herschel Science Centre (ESA/ESAC) Madrid; (3) Institute for Astronomy (ROE) Edinburgh; (4) Instituto de Astrof\\'isica de Andaluc\\'ia (CSIC) Granada; (5) Spitzer Science Centre (Caltech) Pasadena)","submitted_at":"2008-03-17T11:31:41Z","abstract_excerpt":"We analyse Spitzer images of 30 long-duration gamma-ray burst (GRB) host galaxies. We estimate their total stellar masses (M*) based on the rest-frame K-band luminosities (L_Krest) and constrain their star formation rates (SFRs, not corrected for dust extinction) based on the rest-frame UV continua. Further, we compute a mean M*/L_Krest = 0.45 Msun/Lsun. We find that the hosts are low M*, star-forming systems. The median M* in our sample (<M*> = 10^9.7 Msun) is lower than that of \"field\" galaxies (e.g., Gemini Deep Deep Survey). 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