n the night of 2008-03-20 (UT) we observed the optical afterglow of GRB 080319B (GCN 7427, Racusin et al.) with Gemini-South + GMOS in g, r, i, and z filters (4x180s in each filter). The source is well-detected in all bands. Magnitudes, calibrated to SDSS DR6, are: UTstart UTend t(hr) filt mag err 06:52:17 07:10:19 24.808 g 20.95 0.09 07:11:19 07:26:11 25.099 r 20.55 0.03 07:27..

GRBlog: GRB080319B

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