{
  "bibcode": "2005GCN..4136....1B",
  "body": "P. J. Brown (PSU), D. Fox (PSU), M. Trippico (GSFC-SSAI),\nJ. Nousek (PSU),  & N. Gehrels (GSFC)\non behalf of the Swift/UVOT team report:\n\nThe Swift-UVOT began observing the field of\nGRB 051021 (HETE Trigger H3947; Yoshida et al. GCN 4116)\nat 2005-10-21 16:28:27, about 3 hours after the burst.\n\nNo source is detected at the position of the optical\ncounterpart found by Fox, McNaught, & Peterson (GCN 4120)\nin any of our 6 filters down to the following 3-sigma\nupper limits:\n\nFilter  T_range(hours)  Exp(sec)  3sigUL\n\nV       3.36-8.34       1988      20.2\nB       5.30-6.71       1304      21.1\nU       5.04-5.29        900      20.5\nW1      4.79-5.04        900      20.8\nM2      3.61-3.80        900      20.9\nW2      3.11-6.96       1800      21.7\n\nWhere T_range is time post-trigger.",
  "circularId": 4136,
  "createdOn": 1130000466000,
  "email": "pbrown@astro.psu.edu",
  "subject": "GRB051021: Swift/UVOT Upper Limits",
  "submitter": "Peter Brown at PSU  <pbrown@astro.psu.edu>",
  "eventId": "GRB 051021"
}