{
  "bibcode": "2019GCN.24817....1M",
  "body": "F. E. Marshall (NASA/GSFC) and A. D'Ai (INAF-IASFPA)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 190613B\n106 s after the BAT trigger (D'Ai et al., GCN Circ. 24807).\nA source consistent with the enhanced XRT position\n(Beardmore et al. GCN Circ. 24812)\nis detected in the initial UVOT exposures.\n\nThe preliminary UVOT position is:\n    RA  (J2000) =  20:21:43.66 = 305.43191 (deg.)\n    Dec (J2000) = -04:38:48.0  =  -4.64666 (deg.)\nwith an estimated uncertainty of 0.43 arc sec. (radius, 90% confidence).\n\nPreliminary detections and 3-sigma upper limits 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              106          256          147         17.84 +/- 0.04\nv                  648          667           19        >18.0\nb                  574          594           19        >18.7\nu                  318          568          246         18.86 +/- 0.12\nw1                 697          717           19        >18.6\nm2                 672          692           19        >18.4\nw2                 624          643           19        >18.8\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.07 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 24817,
  "createdOn": 1560447579000,
  "email": "marshall@milkyway.gsfc.nasa.gov",
  "subject": "GRB 190613B: Swift/UVOT Detection",
  "submitter": "Frank Marshall at Swift/UVOT  <marshall@milkyway.gsfc.nasa.gov>",
  "eventId": "GRB 190613B"
}