{
  "bibcode": "2019GCN.26287....1K",
  "body": "N. P. M. Kuin (UCL-MSSL) and A. Tohuvavohu (U. Toronto)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 191123A\n78 s after the BAT trigger (Tohuvavohu et al., GCN Circ. 26279).\nA source consistent with the XRT position (Goad et al. GCN Circ. 26284)\nis detected in the initial UVOT exposures.\n\nThe preliminary UVOT position is:\n    RA  (J2000) =  14:21:02.88 = 215.26200 (deg.)\n    Dec (J2000) = +22:51:36.1  =  22.86002 (deg.)\nwith an estimated uncertainty of 0.44 arc sec. (radius, 90% confidence).\n\nPreliminary detections and 3-sigma upper limits using the UVOT photometric\nsystem\n(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures\nare:\n\nFilter         T_start(s)   T_stop(s)      Exp(s)           Mag\n\nwhite               78          228          147         18.25 +/- 0.05\nv                  620         2111          175         18.28 +/- 0.19\nb                  546         1168           58         19.18 +/- 0.25\nu                  290         6376          501        >20.4\nw1                 669         6171          372        >19.9\nm2                1074         5966          216        >19.8\nw2                 595        12186          944        >20.9\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.04 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 26287,
  "createdOn": 1574557045000,
  "email": "npkuin@gmail.com",
  "subject": "GRB 191123A: Swift/UVOT further analysis",
  "submitter": "Paul Kuin at MSSL  <npkuin@gmail.com>",
  "eventId": "GRB 191123A"
}