TITLE: GCN CIRCULAR NUMBER: 9442 SUBJECT: GRB 090530: GRAS002 refined OA analysis DATE: 09/05/30 10:25:37 GMT FROM: Veli-Pekka Hentunen at Taurus Hill Obs,A95 Markku Nissinen (Taurus Hill Observatory) and Veli-Pekka Hentunen (Taurus Hill Observatory) report: We used Global-rent-a-scope GRAS002 Tak Mewlon 0.30m telescope with SBIG ST-8E CCD at RAS Observatory Mayhill H06 (New Mexico, USA) for follow-up observations of GRB090530 (J.K. Cannizzo et al., GCN 9438). The observations were started on May 30, at 05:30 UTC (2.2 hours after the burst) and stopped on May 30, at 06:16 UTC. Four unfiltered 600 seconds images were taken. We detected very faint optical afterglow object at the position of RA 11h 57m 40s.6 and Dec +26o 35' 38".7 (J2000) with respect to POSSII F/USNO-B1.0 and this is in good correlation with ROTSE-III optical counterpart position (H. Flewelling et al., GCN 9439). Upper limit for the observations is >20.2 mag (3UL). Quoted upper limit has been derived using POSSII F and USNO-B1.0 field stars as reference. Filter Tmid(s) Exp(s) Mag (CR) USNO-B1.0 u 05:55:15 4x600 19.2 A jpeg preview of the observation showing the position of the afterglow is at this URL: http://cutenews.kassiopeia.net/data/upimages/GRB090530.jpg