{
  "bibcode": "2018GCN.22758....1G",
  "body": "J. Gropp (PSU) and S. B. Cenko (GSFC)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 180602A\n133 s after the BAT trigger (Cenko et al., GCN Circ. 22752).\nNo optical afterglow consistent with the enhanced XRT position\n(Osborne et al. GCN Circ. 22753)\nis 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           133          283          147         >19.9\nu_FC               291          541          246         >19.8\nwhite              133         1715          411         >20.8\nv                  621         2283          194         >19.0\nb                  547         2208          175         >20.0\nu                  291         2183          401         >20.3\nw1                 670         2159          175         >20.0\nm2                 645          665           19         >18.7\nw2                 597         2086          136         >20.4\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": 22758,
  "createdOn": 1528045918000,
  "email": "jdg44@psu.edu",
  "subject": "GRB 180602A: Swift/UVOT Upper Limits",
  "submitter": "Jeffrey Gropp at PSU  <jdg44@psu.edu>",
  "eventId": "GRB 180602A"
}