{
  "bibcode": "2018GCN.22831....1K",
  "body": "N. P. M. Kuin (UCL-MSSL) and K. L. Page (U. Leicester)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 180623A\n86 s after the BAT trigger (Page et al., GCN Circ. 22828).\nA source consistent with the XRT position (Evans et al. GCN Circ. 22829)\nis detected in the initial UVOT exposures.\n\nThe UVOT refined position is ra, deg = 214.5288,-60.2541 deg which is\nRA = 14:18:06.9\nDec = -60:15:14.8\nwith an estimated uncertainty of 1\".\n\nPreliminary detections and 3-sigma upper limits using the UVOT photometric\nsystem (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early\nexposures are:\n\nFilter         T_start(s)   T_stop(s)      Exp(s)           Mag\n\nwhite               86          236          150        >20.68\nwhite              878          997          119         20.04 +/- 0.24\nv                  629         6296          432        >19.2\nb                18042        18207          162         19.86 +/- 0.28\nu                  299        17732         2252        >21.6\nw1                 678        16819         1318        >20.8\nm2                 653         6501          432        >20.0\nw2                 604         6092          432        >20.0\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 7.04 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 22831,
  "createdOn": 1529848694000,
  "email": "npkuin@gmail.com",
  "subject": "GRB 180623A: Swift/UVOT Detection",
  "submitter": "Paul Kuin at MSSL  <npkuin@gmail.com>",
  "eventId": "GRB 180623A"
}