{
  "bibcode": "2015GCN.17892....1D",
  "body": "M. De Pasquale (UCL-MSSL) and R. L. C. Starling (U Leicester)report on \nbehalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 150530A \n106 s after the BAT trigger (Starling et al., GCN Circ. 17888).\nNo optical afterglow consistent with the XRT position (Goad et al.\nGCN Circ. 17889) 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 finding \nchart (FC) exposure and subsequent exposures are:\n\nFilter         T_start(s)   T_stop(s)      Exp(s)         Mag\n\nwhite_FC           106          256          147 >20.1\nu_FC               319          562          238 >19.2\nwhite              106         5690          541 >21.0\nv                 4465         6101          393 >19.3\nb                 3849         5485          393 >20.4\nu                  319         5280          435 >19.7\nw1                4875         5075          197 >19.5\nm2                4670         6306          393 >19.9\nw2                4260         5896          393 >20.1\n\nThe magnitudes in the table are not corrected for the strong Galactic\nextinction due to the reddening of E(B-V) = 1.81 in the direction of\nthe burst (Schlegel et al. 1998).",
  "circularId": 17892,
  "createdOn": 1433021367000,
  "email": "a.breeveld@ucl.ac.uk",
  "subject": "GRB 150530A: Swift/UVOT Upper Limits",
  "submitter": "Alice Breeveld at MSSL-UCL  <a.breeveld@ucl.ac.uk>",
  "eventId": "GRB 150530A"
}