{
  "bibcode": "2012GCN.13932....1M",
  "body": "F. E. Marshall (NASA/GSFC) and P. A. Evans (U. Leicester)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 121027A\n77 s after the BAT trigger (Evans et al., GCN Circ. 13906).\nA source consistent with the XRT position (Beardmore et al. GCN Circ. 13916)\nand the nIR position (Starling et al. GCN Circ. 13911)\nis weakly detected in the initial UVOT exposures.\n\nThe preliminary detection 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               77         1192          353         21.55 +/- 0.25\nv                  619         1239           75        >19.5\nb                  544         1167           58        >19.7\nu                  289         1143          285        >20.6\nw1                 668         1118           58        >19.8\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.02 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 13932,
  "createdOn": 1351619966000,
  "email": "femarsha@khamseen.gsfc.nasa.gov",
  "subject": "GRB 121027A: Swift/UVOT Possible Detection",
  "submitter": "Frank Marshall at GSFC  <femarsha@khamseen.gsfc.nasa.gov>",
  "eventId": "GRB 121027A"
}