{
  "bibcode": "2010GCN.11272....1D",
  "body": "M. De Pasquale (MSSL-UCL) and M. H. Siegel (PSU) report, on behalf\nof the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of\nGRB 100909A 11747 s after the INTEGRAL trigger (Mereghetti et\n`al.,GCN Circ. 11260). Data summed from the first and second orbits\ndo not reveal a source at the enhanced position of the X-ray\nafterglow (Gelbold et al., GCN Circ. 11268).\n\nThe 3-sigma upper limits f are reported below:\n\nFILTER T_start(s) T_stop    Exposure   Mag/3UL\n========================================================\nwh      11747     25861     1809       >21.9\nv       14755     18362      894       >20.21\nb       11906     44659     1770       >21.48\nu       33619     34527      885       >20.84\nw1      19275     20040      752       >20.39\nw2      13732     14301      561       >20.33\n=======================================================\n\n  The above magnitudes are not corrected for the strong Galactic\nextinction corresponding to a reddening of E_{B-V} = 0.51 (Schlegel\net al., 1998, ApJS, 500, 525). The photometry is on the UVOT\nphotometric system described in Poole et al. (2008, MNRAS, 383, 627).",
  "circularId": 11272,
  "createdOn": 1284153563000,
  "email": "mdp@mssl.ucl.ac.uk",
  "subject": "GRB 100909A: Swift/UVOT observations",
  "submitter": "Massimiliano de Pasquale at MSSL-UCL  <mdp@mssl.ucl.ac.uk>",
  "eventId": "GRB 100909A"
}