TITLE: GCN CIRCULAR NUMBER: 11431 SUBJECT: GRB 101201A: Swift/UVOT Detection DATE: 10/12/02 05:00:45 GMT FROM: Mike Siegel at PSU/Swift MOC M. H. Siegel (PSU) and V. Magnano (INAF-IASFPA) report on behalf of the Swift/UVOT team: The Swift/UVOT began observations of the field of GRB101201A approximately 14 hours after the BAT detection (GCN Circ. 11429). We confirm the uncataloged source reported Guelbenzu et al. (GCN Circ. 11430). We also find evidence of fading between the two orbits. Magnitudes for the first and second orbit exposures are listed below. Filter T_start(s) T_stop(s) Exp(s) Mag white 52065 52087 21 19.90+-0.49 white 57847 58387 531 20.01+-0.11 u 51218 52058 827 19.50+-0.17 u 57000 57840 826 20.01+-0.26 The above magnitudes are not corrected for the Galactic extinction corresponding to a reddening of E_{B-V} = 0.02 (Schlegel et al., 1998, ApJS, 500, 525). The photometry is on the UVOT photometric system described in Poole et al. (2008, MNRAS, 383, 627).