{
  "bibcode": "2007GCN..6641....1S",
  "body": "P. Schady (MSSL-UCL) reports on behalf of the Swift team\n\nThe Swift/UVOT observed the field of GRB 070721B and took a finding chart \nexposure of 100 seconds with the White (160-650 nm) filter starting ~50 \nseconds after the BAT trigger. A candidate afterglow was found on-board in \nthe rapidly available 2.7'x2.7' sub-image, consistent with the XRT \nposition (Ziaeepour et al., GCN 6640) at\n   RA(J2000)  =  02:12:32.95 =  33.1373 degrees\n   DEC(J2000) = -02:11:40.6  =  -2.1946 degrees\nwith a 1-sigma error radius of about 0.9 arc sec. This position is 9.7 \narcsec. from the center of the BAT error circle. The estimated magnitude \nis 15.9 with a 1-sigma error of about 0.5 mag. No correction has been made \nfor the estimated Galactic reddenning of E(B-V)=0.02 mag (Schlegel, \nFinkbeiner & Davic, 1998)",
  "circularId": 6641,
  "createdOn": 1185019559000,
  "email": "ps@mssl.ucl.ac.uk",
  "subject": "GRB070721B: A bright UVOT candidate",
  "submitter": "Patricia Schady at MSSL/Swift  <ps@mssl.ucl.ac.uk>",
  "eventId": "GRB 070721B"
}