{
  "submittedHow": "email",
  "subject": "GRB 261005B: Swift/UVOT Upper Limits",
  "circularId": 45819,
  "eventId": "GRB 261005B",
  "createdOn": 1791294214595,
  "submitter": "Alice Breeveld at MSSL-UCL <a.breeveld@ucl.ac.uk>",
  "body": "A. A. Breeveld (UCL-MSSL), N. Klingler (NASA-GSFC/UMBC/CRESST II) and T.M. Parsotan (GSFC) report on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT started observing the field of GRB 261005B 4424 s after the BAT trigger (Parsotan et al., GCN Circ. 45812).\nNo optical afterglow consistent with the enhanced XRT position (Page et al., GCN Circ. 45815) is detected in the initial UVOT exposures.\nPreliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the data available are:\n\nFilter         T_start(s)   T_stop(s)      Exp(s)         Mag\n\nwhite             5451         5651          197         >20.4\nb                 5247         5446          197         >19.8\nu                 5040         5239          197         >19.3\nv                 4424         4624          197         >18.3\nuvw1              4835         5035          197         >18.7\nuvw2              5658         5836          175         >19.1\nuvm2              4629         4829          197         >18.1\n\n\nThe magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.12 in the direction of the burst (Schlegel et al. 1998)."
}