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We have analysed 2.7 ks of XRT data for GRB 091104 (Curran et al. GCN 10130), from 137 s to 16.5 ks after the BAT trigger. The data comprise 162 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Osborne et al. (GCN. Circ 10131). The light curve can be modelled with a series of power-law decays. The initial decay...Full Text

The Swift/UVOT began settled observations of the field of GRB 091104 139s after the BAT trigger (Curran et al., GCN 10130). No optical afterglow consistent with the enhanched XRT position (Osborne et al., GCN 10131) is detected in the initial UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Poole et al. 2008, MNRAS, 383, 627) for the finding charts (FC) and...Full Text

Using 677 s of XRT Photon Counting mode data and 1 UVOT images for GRB 091104, we find an astrometrically corrected X-ray position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 208.75624, +47.41054 which is equivalent to: RA (J2000): 13h 55m 1.50s Dec (J2000): +47d 24' 37.9" with an uncertainty of 1.6 arcsec (radius, 90% confidence). This position...Full Text

At 08:49:22 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 091104 (trigger=374875). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 208.742, +47.398 which is RA(J2000) = 13h 54m 58s Dec(J2000) = +47d 23' 55" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). As is usual for an image trigger...Full Text