{
  "bibcode": "2011GCN.11765....1D",
  "body": "Swift UVOT observations of GRB110223b\n\nM. De Pasquale (MSSL-UCL) and M. Stamatikos (GSFC) report, on behalf of \nthe Swift team:\n\nSwift/UVOT began settled exposures of GRB110223b (Stamatikos et al. GCN \ncirc. 11754) 77 s after the trigger with a white finding chart. There is \nan uncatalogued source 1.5 arcseconds from the enhanced XRT afterglow \nposition (Beardmore et al., GCN  circ. 11758). This position is also \nconsistent with the optical transient found by GROND (Sudilovsky et al., \nGCN circ. 11756)\n\nThis source, which we identify as the optical afterglow of the burst, is \ndetected in white, v, b, u. Magnitudes and 3 sigma upper limits, derived \nusing the UVOT photometric system  (Poole et al. 2008, MNRAS, 383, 627),\nare shown in the table below. We caution that the photometry is complicated\nby a crowded field.\n\nFilter        T_start(s)    T_end(s)        exp           Magnitude\n\nwhite (FC)       77            227          147.4       18.98 � 0.10\nwhite           620            814           39.0       19.70 � 0.30\nwhite           870           1546          206.0       19.61 � 0.13\n\nv               620           1596          117.3       17.88 � 0.15\n\nb               546           1522           97.4       19.57 � 0.30\n\nu (FC)          290            540          245.8       19.20 � 0.19\nu               694           1496           77.8       >19.30\n\nuw1             670           1471           97.4       >19.16\n\num2             645           1445           97.4       >18.78\n\nuw2             596          1572           116.7       >19.16\n\nThese magnitudes are not corrected for the strong Galactic extinction \nalong the line of sight, corresponding to E(B-V) = 0.23 (Schlegel et al. \n1998)",
  "circularId": 11765,
  "createdOn": 1298555214000,
  "email": "mdp@mssl.ucl.ac.uk",
  "subject": "Swift/UVOT observations of GRB110223b",
  "submitter": "Massimiliano de Pasquale at MSSL-UCL  <mdp@mssl.ucl.ac.uk>",
  "eventId": "GRB 110223B"
}