{
  "bibcode": "2009GCN..9954....1K",
  "body": "N.P.M. Kuin (MSSL-UCL) and D. Grupe (PSU) report on behalf\nof the Swift/UVOT team:\n\nThe Swift/UVOT began a delayed observing the field of GRB 090927\n2121s after the trigger due to an observing constraint (Grupe, GCN\nCirc. 9945). We detect a fading optical afterglow in white, v,b,\nand u filters at the position reported by UVOT (Gronwall et al.,\nGCN Circ. 9946).\n\nPreliminary magnitudes are reported below.\n\nFilter   T_start(s) T_stop(s) Exposure(s) Magnitude\n===================================================\nwhite(FC)    2141    2291    147.4    19.13 +/- 0.09\nwhite        2372    2920    235.6    19.40 +/- 0.09\nv            2121    2617     48.6    19.0  +/- 0.37\nv            3131    3331    196.6    19.37 +/- 0.25\nb            2348    2542     38.9    19.50 +/- 0.31\nb            2696    2716     19.5    19.09 +/- 0.34\nu            2323    2517     38.9    18.77 +/- 0.26\nu            2671    2691     19.5   >18.89\nuvw1         2299    3576     92.8   >19.63\nuvm2         2446    3536    235.6   >19.89\nuvw2         2397    2592     38.9   >18.84\n====================================================\n\nThe above magnitudes are not corrected for the Galactic extinction\ncorresponding to a reddening of E_{B-V} = 0.03 mag (Schlegel et al.,\n1998, ApJS, 500, 525).  The photometry is on the UVOT photometric\nsystem described in Poole et al. (2008, MNRAS, 383,627).",
  "circularId": 9954,
  "createdOn": 1254077892000,
  "email": "npkuin@googlemail.com",
  "subject": "Swift/UVOT observations of GRB 090927",
  "submitter": "Paul Kuin at MSSL  <npkuin@googlemail.com>",
  "eventId": "GRB 090927"
}