TITLE: GCN CIRCULAR NUMBER: 12126 SUBJECT: GRB 110709B: possible quiescent source in DSS DATE: 11/07/09 23:41:46 GMT FROM: Andrew Levan at U.of Leicester A.J. Levan (University of Warwick) reports: "Inspection of DSS-II images of the region around GRB 110709B (Cummings et al. GCN 12122) shows a faint optical source at a location of RA(J2000) 10:58:37.34 DEC(J2000) -23:27:21.6 offset 3.9" from the centre of the XRT error circle (which currently has a 5.3", 90% confidence error). The source is apparently also detected in USNO-A2.0, with reported magnitudes of B=21.2, R=17.9 (although at this faint level the associated errors are large). This source may be a quiescent counterpart of GRB 110709B, although could also be an unrelated background (or foreground) source. The probability of chance alignment with a source with R~18 in this error region is ~1-2% (e.g. Bloom, Kulkarni, Djorgovski 2002, AJ 123, 1111)"