TITLE: GCN CIRCULAR NUMBER: 8577 SUBJECT: GRB 081128: Liverpool Telescope afterglow confirmation DATE: 08/11/29 11:21:44 GMT FROM: Cristiano Guidorzi at INAF-OAB C. Guidorzi (INAF-OAB), N. Tanvir (U. Leicester), I.A. Steele, R.J. Smith, C.G. Mundell, D. Bersier (Liverpool JMU), A. Gomboc (U. Ljubljana) report on behalf of a larger collaboration: On 2008 November 28 (22:16:14 UT) we began observing the field of GRB 081128 (Margutti et al. GCN Circ. 8571) with the Liverpool Telescope. Observations consisted of two sequences of 6x300s exposures acquired using the SDSS-i and SDSS-r filters, respectively. In our coadded frame we detect a single source inside the refined XRT error box (Evans et al. GCN Circ. 8573) at the position RA(J2000)=01:23:13.05, Dec(J2000)=+38:07:38.7 (0.6" error radius) consistent with the optical candidate reported by Lin et al. (GCN Circ. 8575) and Andreev et al. (GCN Circ. 8576). We found the following magnitude for this object: Telescope Filter T_mid[hr] Exposure[s] M_lim ----------------------------------------------------------- LT SDSS-r 6.66 6x300 21.9 +/- 0.2 ----------------------------------------------------------- The calibration was performed using the R2 magnitudes of several USNOB-1 catalogue field objects. Compared with the value reported by Lin et al. (GCN Circ. 8575), our measurement shows that the candidate has faded between the two epochs. There also appears to be a neighbouring source just outside the XRT error circle, which might be a host galaxy.