{
  "bibcode": "2013GCN.15375....1S",
  "body": "M. H. Siegel (PSU) and J. L. Racusin (NASA/GSFC)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 131024A\n137 s after the BAT trigger (Racusin et al., GCN Circ. 15365).\nNo optical afterglow consistent with the enhanced XRT position\n(Osborne et al., GCN Circ. 15367) is detected in the initial UVOT exposures.\nPreliminary 3-sigma upper limits using the UVOT photometric system\n(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first\nfinding chart (FC) exposure and subsequent exposures are:\n\nFilter         T_start(s)   T_stop(s)      Exp(s)         Mag\n\nwhite (fc)         136          286          147         >20.63\nwhite              136         1542          392         >21.69\nv                  624         1592          116         >18.91\nb                  550         1517           97         >19.75\nu (fc)             294          544          245         >19.99\nu                  294         1492          569         >20.49\nuvw1               673         1468           97         >19.15\nuvm2               648         1606          106         >18.99\nuvw2               600         1567          116         >19.48\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.05 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 15375,
  "createdOn": 1382671303000,
  "email": "siegel@swift.psu.edu",
  "subject": "GRB 131024A: Swift/UVOT Upper Limits",
  "submitter": "Mike Siegel at PSU/Swift MOC  <siegel@swift.psu.edu>",
  "eventId": "GRB 131024A"
}