{
  "bibcode": "2017GCN.20644....1S",
  "body": "M. H. Siegel (PSU) and A. Cholden-Brown (PSU)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 170208A\n125 s after the BAT trigger (Cholden-Brown et al., GCN Circ. 20631).\nNo optical afterglow consistent with the enhanced XRT position\n(Evans et al. GCN Circ. 20634)\nis detected in the initial UVOT exposures.\nPreliminary 3-sigma upper limits using the UVOT photometric system\n(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first\nfinding chart (FC) exposure and subsequent exposures are:\n\nFilter         T_start(s)   T_stop(s)      Exp(s)         Mag\n\nwhite_FC           125          275          148         >21.4\nu_FC               337          587          246         >20.7\nwhite              125         1365          373         >21.9\nv                  667         1415           97         >19.3\nb                  593         1503           87         >19.4\nu                  337         1489          324         >20.2\nw1                 717         1464           78         >19.4\nw2                 642         1390           97         >19.3\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.13 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 20644,
  "createdOn": 1486651554000,
  "email": "siegel@swift.psu.edu",
  "subject": "GRB 170208A: Swift/UVOT Upper Limits",
  "submitter": "Mike Siegel at PSU/Swift MOC  <siegel@swift.psu.edu>",
  "eventId": "GRB 170208A"
}