{
  "bibcode": "2008GCN..8567....1H",
  "body": "S. T. Holland (CRESST/GSFC/USRA) and J. Mao (INAF-OAB) report on the\nbehalf of the Swift UVOT team:\n\n       The Swift/UVOT observed the field of GRB 081127 starting 113 s\nafter the BAT trigger (Mao, et al. 2008, GCN Circ. 8560).  Settled\nexposures started at T+131 s.  We do not find any new source, relative\nto the DSS or 2MASS, or any variable source inside the UVOT-enhanced\nXRT error circle (Beardmore, et al. 2008, GCN Circ. 8565).\nPreliminary 3-sigma upper limits for detecting a source in the white\nfinding chart, and the co-added images, using a 2.5 arcsecond radius\ncircular aperture, are\n\nFilter   T_start   T_stop   Exp(s)     Mag\n------------------------------------------\n  white       130      380      147   >21.3\n\n     v        365   18,799     1473   >21.0\n     b        466     7263      568   >21.4\n     u        440   13,713     1246   >21.4\n   uvw1       415   13,011     1276   >21.6\n   uvm2       389   19,496     2004   >21.8\n   uvw2       341   17,885     1473   >21.8\n  white       490     7468      714   >22.2\n------------------------------------------\n\nThe quoted upper limits have not been corrected for the expected\nGalactic extinction along the line of sight corresponding to a\nreddening of E_{B-V} = 0.09 mag (Schlegel, et al., 1998, ApJS, 500,\n525).  All photometry is on the UVOT photometry system described in\nPoole et al. (2008, MNRAS, 383, 627).\n\n      The B = 13.15 mag USNO-B1.0 star 0968-0627697 is located\napproximately 4 arcsec north of the XRT position.  UVOT photometry at\nthe location of the X-ray source is contaminated by this star.",
  "circularId": 8567,
  "createdOn": 1227809029000,
  "email": "sholland@milkyway.gsfc.nasa.gov",
  "subject": "GRB 081127: Swift/UVOT Upper Limits",
  "submitter": "Stephen Holland at USRA/NASA/GSFC/SSC  <sholland@milkyway.gsfc.nasa.gov>",
  "eventId": "GRB 081127"
}