GCN Circular 17547
M. H. Siegel, L.M.Z. Hagen (PSU) and A. Y. Lien (GSFC/UMBC) report on behalf of the Swift UVOT team: Swift continues to observe the field of BAT trigger 633105 (formerly GRB 150301C, now Swift J0045.2+4151) with a sky location in M31. The UVOT data show no change in brightness in the optical source reported in Hagen & Lien (GCN Circ 17541). Preliminary detections and 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the most recent exposures are: Filter T_start(s) T_stop(s) Exp(s) Mag v 338602 338728 124 >18.25 b 337955 338082 124 >19.12 u 337824 337951 124 18.45+-0.27 uvw1 337564 337819 250 18.82+-0.26 uvm2 326044 343973 4048 18.64+-0.06 uvw2 338088 338597 500 18.72+-0.14 All of these magnitudes are consistent, within uncertainties, of our initial and archival measures. We further report an analysis of 207 ks of archival UVOT data for the source. Our analysis shows no previous variability in the source in the UVOT photometry, which has a typical uncertainty of 0.2 mag in the three UV filters.