{
  "bibcode": "2018GCN.23336....1K",
  "body": "N. P. M. Kuin (UCL-MSSL) and P. D'Avanzo (INAF-OAB)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 181013A 106 s\nafter\nthe BAT trigger (D'Avanzo et al., GCN Circ. 23332). No optical afterglow\nconsistent\nwith the XRT position (Osborne et al. GCN Circ. 23334) is detected in the\ninitial\nUVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric\nsystem\n(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first finding\nchart (FC)\nexposure and subsequent exposures are:\n\nFilter         T_start(s)   T_stop(s)      Exp(s)         Mag\n\nwhite_FC           867         1017          147         >20.2\nu_FC               266          516          246         >19.1\nwhite              867         1017          147         >20.2\nu                  266          516          246         >19.1\nw1                 818         7875          471         >20.4\nm2                6035         7669          393         >19.6\nw2                5624         7260          393         >20.8\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.01 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 23336,
  "createdOn": 1539477064000,
  "email": "npkuin@gmail.com",
  "subject": "GRB 181013A: Swift/UVOT Upper Limits",
  "submitter": "Paul Kuin at MSSL  <npkuin@gmail.com>",
  "eventId": "GRB 181013A"
}