{
  "bibcode": "2016GCN.19513....1L",
  "body": "S. J. LaPorte (PSU) and T. N. Ukwatta (LANL)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 160607A\n84 s after the BAT trigger (Ukwatta et al., GCN Circ. 19502).\nNo optical afterglow consistent with the enhanced XRT position\n(Goad et al., GCN Circ. 19503) nor at the position of the NOT source\n(Malesani et al., GCN 19507), 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            84          233          147         >20.4\nu_FC               296          546          246         >19.9\nwhite               84         1658          299         >20.6\nv                  626         1707          117         >18.7\nb                  552         1633          115         >19.5\nu                  296         1088          393         >19.9\nw1                 849         1237           39         >19.0\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": 19513,
  "createdOn": 1465411554000,
  "email": "siegel@swift.psu.edu",
  "subject": "GRB 160607A: Swift/UVOT Upper Limits",
  "submitter": "Mike Siegel at PSU/Swift MOC  <siegel@swift.psu.edu>",
  "eventId": "GRB 160607A"
}