{
  "bibcode": "2016GCN.20339....1K",
  "body": "N. P. M. Kuin (UCL-MSSL) and A. Cholden-Brown (PSU)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 161224A\n28.3ks after the BAT trigger after a Sun constraint (Cholden-Brown\net al., GCN Circ. 20335). At the position of the XRT source (Cholden-Brown\nand\nEvans, GCN Circ. 20338) no uv-optical source was found to the upper limits\nbelow.\n\nPreliminary 3-sigma upper limits using the UVOT photometric system\n(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures\nare:\n\nFilter  T_start(s) T_stop(s)  Exp(s)    Mag\nu       44266.0    44786.3     508      >19.99\nv       28322.2    50899.7    1770      >19.90\nuvw1    35223.6    41032.4     786      >19.91\nuvw2    46285.0    46772.6     480      >19.88\nuvm2    29234.3    35216.6    1198      >20.48\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.096 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 20339,
  "createdOn": 1482754337000,
  "email": "npkuin@gmail.com",
  "subject": "GRB 161224A: Swift/UVOT Upper limits",
  "submitter": "Paul Kuin at MSSL  <npkuin@gmail.com>",
  "eventId": "GRB 161224A"
}