{
  "createdOn": 1700484123800,
  "circularId": 35135,
  "subject": "231118A: Swift-UVOT Detection",
  "submitter": "Paul Kuin at MSSL <npkuin@gmail.com>",
  "body": "N.P.M. Kuin (MSSL/UCL) and S. L. Laha (GSFC/UMBC)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 231118A\n105 s after the BAT trigger (Laha et al., GCN Circ. 35101).\nA source consistent with the XRT position (Evans et al., GCN Circ. 35106)\nis detected in the initial UVOT exposures.\n\nThe preliminary UVOT position is:\n    RA  (J2000) =  00:19:19.26 =   4.83024 (deg.)\n    Dec (J2000) = -48:02:24.1  = -48.04004 (deg.)\nwith an estimated uncertainty of 0.42 arc sec. (radius, 90% confidence).\n\nPreliminary detections using the UVOT photometric system\n(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are:\n\nFilter         T_start(s)   T_stop(s)      Exp(s)           Mag\n\nwhite              105          255          147         17.28 +/- 0.03\nv                 1052         1071           20         16.59 +/- 0.16\nb                  573          593           19         17.10 +/- 0.11\nu                  318          568          246         16.69 +/- 0.04\nw1                1618         1638           19         17.18 +/- 0.24\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.013 in the direction of the burst\n(Schlegel et al. 1998).\n",
  "bibcode": "2023GCN.35135....1K",
  "submittedHow": "email-legacy"
}