[vsnet-grb-info 3177] GRB 060427: Swift/UVOT upper limits.

[GCN Circulars]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  5012
SUBJECT: GRB 060427: Swift/UVOT upper limits.
DATE:    06/04/27 21:25:56 GMT
FROM:    Massimiliano de Pasquale at MSSL-UCL  <mdp at mssl.ucl.ac.uk>

  M. De Pasquale (UCL-MSSL), V. Mangano (IASF Palermo) report on
behalf of the Swift/UVOT team:

  The Swift/UVOT began taking data on the field of GRB060427
at 11:45:13 UT on 2006-04-27, 122 s after the BAT trigger
(Mangano et al., GCN 5006), with the settling exposure. No
afterglow candidate was detected at the refined XRT position
(Falcone et al., GCN  5009) in summed images from any of
the filters down to the following three-sigma upper
limits.

  Filter  T_range(s)  Exp(s) 3sig_UL

  V       122-6920   1668   20.4
  B       610-6635    416   20.7
  U       585-6430    436   20.3
  UVW1    562-6226    457   20.0
  UVM2    562-6021    456   20.0
  UVW2    626-6840    436   20.5

  These upper limits are uncorrected for the estimated Galactic
reddening of E_{B-V} = 0.051 mag (Schlegel et al. 1998).