{
  "bibcode": "2016GCN.19631....1L",
  "body": "S. J. LaPorte (PSU) and H. A. Krimm (CRESST/GSFC/USRA)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 160630A\n87 s after the BAT trigger (Krimm et al., GCN Circ. 19624).\nNo optical afterglow consistent with the enhanced XRT position\n(Goad et al., GCN Circ 19626) or the optical/IR position\n(Kann et al. GCN Circ. 19625) 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            87          237          147         >20.6\nu_FC               300          550          246         >19.9\nwhite               87         6366          530         >21.7\nv                  630         6777          439         >20.2\nb                  555         6161          236         >20.5\nu                  300         5956          462         >20.6\nw1                 680         7042          290         >19.7\nm2                 655         6982          432         >20.9\nw2                 606         6572          255         >19.7\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.48 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 19631,
  "createdOn": 1467300142000,
  "email": "siegel@swift.psu.edu",
  "subject": "GRB 160630A: Swift/UVOT Upper Limits",
  "submitter": "Mike Siegel at PSU/Swift MOC  <siegel@swift.psu.edu>",
  "eventId": "GRB 160630A"
}