{
  "bibcode": "2012GCN.13698....1O",
  "body": "S. R. Oates (MSSL-UCL) 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 120821A\n15ks after the INTEGRAL trigger (Mereghetti et al., GCN Circ. 13696).\nNo optical afterglow consistent with the INTEGRAL position\n(Mereghetti et al., GCN Circ. 13696) 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 initial exposures are:\n\nFilter         T_start(s)   T_stop(s)      Exp(s)         Mag\n\nu                17059        17241          179         >20.92\nw1               16153        17053          886         >21.7\nm2               15246        16146          886         >21.6\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 25.4 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 13698,
  "createdOn": 1345635486000,
  "email": "sro@mssl.ucl.ac.uk",
  "subject": "GRB 120821A: Swift/UVOT Upper Limits",
  "submitter": "Samantha Oates at MSSL  <sro@mssl.ucl.ac.uk>",
  "eventId": "GRB 120821A"
}