TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3596 SUBJECT: GRB050712: Swift UVOT Observation of Afterglow Emission DATE: 05/07/13 17:49:21 GMT FROM: Alexander Blustin at MSSL-UCL This message is in MIME format. The first part should be readable text, while the remaining parts are likely unreadable without MIME-aware tools. ---1605949312-135341040-1121276953=:1247092 Content-Type: TEXT/PLAIN; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE T. Poole (MSSL), D. Grupe (PSU), A. Breeveld (MSSL), L. Angelini (GSFC-JHU), J. Greiner (MPE) on behalf of the Swift UVOT team The Swift Ultra-Violet/Optical Telescope (UVOT) began observations of GRB050712 (Grupe et al. GCN 3573; E.Rol et al. GCN 3575) on 12th July 2005 at 14:02:58 UT. We detect a source inside the XRT error circle (Falcone et al. GCN 3574) in the V and U bands. It initially fades, then brightens before fading below the detection threshold. It is not detected in the UV filters. No B observations were taken because of a bright source in the field of view violating the UVOT count rate limits. The aperture for optical observations (V and U) was 6 arcsec and for the UV 12 arcsec. The limiting magnitudes are given to a 3 sigma limit. V filter start exposure mid magnitude time time time after =09after burst burst (s) (s) (s) 164 100 214 17.97 =B1 0.09 - source detection 313 10 318 17.85 =B1 0.20 - source detection 383 10 388 18.69 =B1 0.20 - source detection 455 10 460 18.13 =B1 0.20 - source detection 526 10 531 18.04 =B1 0.20 - source detection 597 10 602 17.99 =B1 0.20 - source detection 668 49 693 17.83 - limiting magnitude 1207 100 1257 18.01 - limiting magnitude 11414 900 11864 22.15 - limiting magnitude U filter start exposure mid magnitude time time time after after burst burst (s) (s) (s) 282 10 287 17.92 =B1 0.20 - source detection 353 10 358 17.82 - limiting magnitude 425 10 430 17.75 - limiting magnitude 425 10 430 19.47 =B1 0.20 - source detection 496 10 501 18.16 =B1 0.20 - source detection 639 49 664 18.50 - limiting magnitude 996 100 1051 18.74 - limiting magnitude 6477 663 6809 19.83 - limiting magnitude UVW1 start exposure mid magnitude time time time after after burst burst (s) (s) (s) 268 107 322 18.49 - limiting magnitude 1970 833 2387 19.62 - limiting magnitude UVM2 - limiting magnitudes start exposure mid magnitude time time time after after burst burst (s) (s) (s) 325 98 374 19.05 - limiting magnitude 1310 46 1333 18.36 - limiting magnitude 4663 1447 723 20.36 - limiting magnitude UVW2 - limiting magnitudes start exposure mid magnitude time time time after after burst burst (s) (s) (s) 298 98 347 19.05 - limiting magnitude 1102 100 1152 20.15 - limiting magnitude 10447 900 10897 21.57 - limiting magnitude We caution that the instrument is not yet fully calibrated and that the magnitude limits presented here may need to be refined. This message may be cited. ---1605949312-135341040-1121276953=:1247092--