{
  "bibcode": "2016GCN.19871....1L",
  "body": "S. J. LaPorte (PSU) and B. Mingo (U. Leicester)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 160826A\n109 s after the BAT trigger (Mingo et al., GCN Circ. 19866).\nNo optical afterglow consistent with the XRT position\n(Mingo et al. GCN Circ. 19868)\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           109          259          147         >21.1\nu_FC               267          517          246         >19.8\nwhite              109         1195          353         >22.1\nv                  597         1245           78         >19.8\nb                  523         1170           58         >20.2\nu                  267         4893          340         >19.8\nw1                 648         1290           74         >19.0\nm2                 622         1269           78         >19.3\nw2                 573         1220           78         >19.9\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.47 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 19871,
  "createdOn": 1472238050000,
  "email": "siegel@swift.psu.edu",
  "subject": "GRB 160826A: Swift/UVOT Upper Limits",
  "submitter": "Mike Siegel at PSU/Swift MOC  <siegel@swift.psu.edu>",
  "eventId": "GRB 160826A"
}