{
  "bibcode": "2015GCN.18456....1B",
  "body": "B. G. Balzer (PSU) and P. D'Avanzo (INAF-OAB)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 151022A\n304 s after the BAT trigger (D'Avanzo et al., GCN Circ. 18436).\nNo optical afterglow consistent with the XRT position\n(Evans GCN Circ. 18438) 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           304          454          147         >21.2\nwhite              304         7836          902         >22.0\nv                  461         8247          646         >20.1\nb                  560         7632          430         >21.0\nu                  535         7426          430         >21.2\nw1                 510        12075          553         >19.7\nm2                 486         8452          646         >20.3\nw2                 609         8042          627         >20.2\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.56 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 18456,
  "createdOn": 1445631109000,
  "email": "siegel@swift.psu.edu",
  "subject": "GRB 151022A: Swift/UVOT Upper Limits",
  "submitter": "Mike Siegel at PSU/Swift MOC  <siegel@swift.psu.edu>",
  "eventId": "GRB 151022A"
}