{
  "bibcode": "2010GCN.10394....1M",
  "body": "F.E. Marshall (NASA/GSFC) and H.A. Krimm (CRESST/GSFC/USRA)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 100206A\n78 s after the BAT trigger (Krimm et al., GCN Circ. 10376).\nNo optical afterglow consistent with the refined XRT position\n(Goad et al., GCN Circ. 10378) or the candidate optical afterglow\nposition (Levan et al., GCN Circ. 10386)\nis detected in the initial UVOT exposures.\nPreliminary 3-sigma upper limits using the UVOT photometric system\n(Poole et al. 2008, MNRAS, 383, 627) for the first finding chart (FC)\nexposures and subsequent exposures are:\n\nFilter         T_start(s)   T_stop(s)      Exp(s)         Mag\n\nwhite_FC            78          228          147         >20.5\nu_FC               290          540          246         >20.1\nwhite               78         7046          647         >21.4\nv                  619         7457          553         >20.1\nb                  545        13655         1223         >21.2\nu                  290        12756         1464         >20.5\nw1                 668         7866          510         >20.7\n\nThe values quoted above are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.38 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 10394,
  "createdOn": 1265562184000,
  "email": "marshall@milkyway.gsfc.nasa.gov",
  "subject": "GRB 100206A: Swift/UVOT Upper Limits",
  "submitter": "Frank Marshall at GSFC  <marshall@milkyway.gsfc.nasa.gov>",
  "eventId": "GRB 100206A"
}