TITLE: GCN CIRCULAR NUMBER: 11762 SUBJECT: GRB 110223A: Liverpool Telescope observations DATE: 11/02/24 11:24:50 GMT FROM: Cristiano Guidorzi at Ferrara U,Italy C. Guidorzi (U. Ferrara), A. Melandri (INAF-OAB), I.A. Steele, C.G. Mundell, S. Kobayashi (Liverpool JMU), A. Gomboc (U. Ljubljana) on behalf of a large collaboration report: The 2-m Liverpool Telescope automatically began observing GRB 110223A (Sakamoto et al. GCN Circ. 11753) on February 23, 20:59:47 UT, 2.8 minutes from the GRB trigger time with the SDSS filters riz. Within the UVOT-enhanced XRT error circle (Evans et al., GCN Circ. 11759) we do not find any source down to the following limiting magnitudes. Mid time from Tot Exposure Filter Limiting Magnitude trigger (s) (s) ------------------------------------------------------------ 1920 780 r > 22.2 2320 720 i > 21.6 2620 720 z > 19 ------------------------------------------------------------ Calibration is against some nearby USNOB-1 stars (R2 and I magnitudes). However, we note the presence of an uncatalogued source at RA = 23:03:20.31, Dec = +87:33:29.3 (J2000), lying 3.4" from the XRT centre with the following magnitudes: r = 21.6 +- 0.1 i = 20.9 +- 0.1 This source does not exhibit any fading during the observations.