{
  "bibcode": "2015GCN.17323....1C",
  "body": "M. M. Chester (PSU) and V. D'Elia (ASDC) report on behalf of \nthe Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 150120A\n83 s after the BAT trigger (D'Elia et al., GCN Circ. 17310).\nNo optical afterglow consistent with the XRT position (Evans et al. \nGCN Circ. 17317) 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) exposures and subsequent exposures are:\n\nFilter         T_start(s)   T_stop(s)      Exp(s)         Mag\n\nwhite_FC            83          233          147         >20.6\nu_FC               295          545          246         >20.1\nwhite               83         5674          461         >21.0\nv                  624         6085          432         >19.5\nb                  550        10198          449         >21.0\nu                  295         6700          658         >20.6\nw1                 674         6495          432         >20.5\nm2                 649         6290          432         >21.1\nw2                 600         5880          432         >20.5\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.10 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 17323,
  "createdOn": 1421783798000,
  "email": "chester@swift.psu.edu",
  "subject": "GRB 150120A: Swift/UVOT Upper Limits",
  "submitter": "Margaret Chester at PSU  <chester@swift.psu.edu>",
  "eventId": "GRB 150120A"
}