{
  "bibcode": "2015GCN.18753....1D",
  "body": "M. De Pasquale (UCL-MSSL) and D. Kocevski (NASA/GSFC/ORAU)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 151229A\n90 s after the BAT trigger (Kocevski et al., GCN Circ. 18745).\nNo optical afterglow consistent with the XRT position (Osborne et al.\nGCN Circ. 18750) 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            90          240          147         >20.0\nu_FC               302          552          246         >19.3\nwhite               90         5493          378         >20.5\nv                  632         5904          413         >18.8\nb                  558         5288          236         >19.5\nu                  302         6513          653         >19.8\nw1                 681         6314          413         >19.7\nm2                4474         6108          393         >19.9\nw2                4064         5699          393         >20.0\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.03 in the direction of the burst\n(Schlegel et al. 1998).\n\n-- \n\nDr. Massimiliano De Pasquale\nResearch associate - Swift UVOT scientist\nMullard Space Science Laboratory, University College London",
  "circularId": 18753,
  "createdOn": 1451399836000,
  "email": "m.depasquale@ucl.ac.uk",
  "subject": "GRB 151229A: Swift/UVOT observations",
  "submitter": "Massimiliano de Pasquale at IASF-Palermo  <m.depasquale@ucl.ac.uk>",
  "eventId": "GRB 151229A"
}