{
  "bibcode": "2014GCN.17057....1M",
  "body": "F.E. Marshall (NASA/GSFC) 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 141109A\n139 s after the BAT trigger (D'Avanzo et al., GCN Circ. 17037).\nA source consistent with the optical position (Covino, GCN Circ. 17039;\nXu et al., GCN Circ. 17040) is detected in the initial UVOT exposures.\n\nThe preliminary 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              139          289          147         20.0 +/- 0.2\nwhite             3991         4191          197         20.8 +/- 0.2\nv                 5656         5856          197        >18.9\nb                 3786         3986          197        >20.3\nu                  297         6276          227        >19.7\nw1                6066         6266          197        >20.1\nm2                5861         6061          197        >20.7\nw2                4197         4339          140        >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": 17057,
  "createdOn": 1415660116000,
  "email": "femarsha@khamseen.gsfc.nasa.gov",
  "subject": "GRB 141109A: Swift/UVOT Detection",
  "submitter": "Frank Marshall at GSFC  <femarsha@khamseen.gsfc.nasa.gov>",
  "eventId": "GRB 141109A"
}