TITLE: GCN CIRCULAR NUMBER: 13144 SUBJECT: GRB 120327A afterglow detection DATE: 12/03/27 20:48:42 GMT FROM: Petr Kubanek at AIO S. Meehan, L. Hanlon, M. Topinka (UCD Dublin), P. Kubanek (FZU AV CR Prague), report on behalf of a large collaboration: We imaged the field of GRB 120327A detected by SWIFT (trigger 518731) with the Watcher robotic telescope (D=40cm) located at Boyden Observatory, Bloemfontein, South Africa. Our first good observation was 14.4 min after the GRB trigger, 3 min after receipt of the GCN notice. The source was close to the zenith with an airmass of 1.01. We detect a fading source in the error box given by SWIFT, which coincides with candidate counterpart mentioned by Sbarufatti et al. (GCN 13123). The optical transient was measured at 15.5 +/- 0.1 mag @ 14.4 minutes after the trigger in the clear filter. Magnitudes were estimated using the nearby USNO-B1 stars as references and are not corrected for galactic dust extinction. Analysis of the remaining images is on-going.