TITLE: GCN CIRCULAR NUMBER: 7446 SUBJECT: GRB 080319B: REM early data DATE: 08/03/19 13:44:13 GMT FROM: Stefano Covino at Brera Astronomical Observatory S. Covino, P. D'Avanzo, D. Fugazza, L.A. Antonelli, L. Calzoletti, S. Campana, G. Chincarini, M.L. Conciatore, S. Cutini, V. D'Elia, F. D'Alessio, F. Fiore, P. Goldoni, D. Guetta, C. Guidorzi, G.L. Israel, E. Maiorano, N. Masetti, A. Melandri, E. Meurs, L. Nicastro, E. Palazzi, E. Pian, S. Piranomonte, L. Stella, G. Stratta, G. Tagliaferri, G. Tosti, V.Testa, S.D. Vergani, F. Vitali report on behalf of the REM team: We started a refined analysis of the REM observations of GRB 080319B (GCN 7427, Racusin et al.). As already reported by Cwiok et al. (GCN 7439 and 7445) the optical counterpart of this GRB was exceptionally bright at early time. We measured, about 1 min after the burst, R~6.4 assuming R=11.20 for the USNO star at coordinates RA,DEC = 14:31:23.61, 36:21:56.5. The source was already almost 2 mag fainter half a minute later. In the H band the source was H~5 around the same epoch. Further analyses are in progress.