{
  "bibcode": "2006GCN..5088....1M",
  "body": "F. E. Marshall and L. M. Barbier (NASA/GSFC) report on behalf\nof the Swift/UVOT team:\n\nThe Swift UVOT began observing GRB 060507 (trigger #208870, Barbier et\nal., GCN 5084) 46 minutes after the BAT trigger.\nNo optical afterglow is detected inside the error region of the\ncandidate XRT afterglow (Vetere et al. GCN 5085).\nTypical upper limits for a 3.5 arc sec aperture are given below\nfor the initial UVOT exposures. T is the time since\nthe BAT trigger in seconds at the start of the exposure.\nNo correction has been made for the expected extinction\ncorresponding to E(B-V) = 0.16 mag.\n\n  T   Exposure  filter  5-sigma UL\n(sec)  (sec)\n2790    98      White   19.4 mag\n2896   197      V       18.7 mag\n9567   295      White   20.6 mag",
  "circularId": 5088,
  "createdOn": 1147021976000,
  "email": "marshall@milkyway.gsfc.nasa.gov",
  "subject": "GRB 060507: Swift/UVOT Upper Limits",
  "submitter": "Frank Marshall at GSFC  <marshall@milkyway.gsfc.nasa.gov>",
  "eventId": "GRB 060507"
}