{
  "bibcode": "2006GCN..5735....1M",
  "body": "F.E. Marshall (NASA/GSFC) and C. Guidorzi (Univ Bicocca&INAF-OAB)\nreport on behalf of the Swift-UVOT team:\n\nThe Swift UVOT began observing the GRB 061019 field (trigger 234516) 2790\nseconds after the BAT trigger (Guidorzi et al. GCN Circ. 5728). Exposures \nwere taken with the V, B, U, W1, M2, and W2 filters. No new source was detected\nwithin the XRT error circle (Guidorzi et al. GCN Circ. 5733). \nThe effects of a nearby bright star complicate the analysis, but \nwe estimate a 3-sigma upper limit of ~19th magnitude at the position \nof the optical afterglow (Covino et al. GCN Circ. 5730; Cobb et al. GCN Circ. 5734) \nfor the initial exposure with the V filter.",
  "circularId": 5735,
  "createdOn": 1161291578000,
  "email": "marshall@milkyway.gsfc.nasa.gov",
  "subject": "GRB 061019: Swift/UVOT upper limit",
  "submitter": "Frank Marshall at GSFC  <marshall@milkyway.gsfc.nasa.gov>",
  "eventId": "GRB 061019"
}