{
  "bibcode": "2014GCN.17017....1O",
  "body": "S. R. Oates (IAA-CSIC/UCL-MSSL) and B. P. Gompertz (U Leicester)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 141031B\n120 s after the BAT trigger (Gompertz et al., GCN Circ. 16998).\nNo optical afterglow consistent with the XRT position\n(Goad et al. GCN Circ. 17009)\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           120          270          147         >21.0\nu_FC               278          528          246         >20.3\nwhite              120         6181          580         >21.8\nv                  608        11035         1317         >20.6\nb                  534         5976          432         >20.9\nu                  278         5771          659         >20.9\nw1                 658        12348          620         >20.7\nm2                 633        11940         1121         >20.9\nw2                 584         6386          432         >20.5\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.14 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 17017,
  "createdOn": 1414840198000,
  "email": "sro@mssl.ucl.ac.uk",
  "subject": "GRB 141031B: Swift/UVOT Upper Limits",
  "submitter": "Samantha Oates at MSSL  <sro@mssl.ucl.ac.uk>",
  "eventId": "GRB 141031B"
}