{
  "bibcode": "2005GCN..3026....1R",
  "body": "P. Roming (PSU), K. Mason, P. Schady (MSSL), M. Ivanushkina (PSU), T. Poole \n(MSSL), C. Gronwall (PSU), A. Blustin (MSSL), P. Brown (PSU), P. Schady, S. \nRosen, K. McGowan, M. De Pasquale (MSSL), P. Boyd (GSFC/UMBC), S. Holland, \nM. Still (GSFC/USRA), W. Landsman (GSFC), S. Hunsberger (PSU), A. Breeveld \n(MSSL), S. Koch (PSU), M. Carter, H. Huckle (MSSL), P. Broos (PSU), T. \nKennedy, P. Smith, B. Hancock (MSSL), J. Kennea (PSU), J. Cummings (GSFC), \nT. Sakamoto  (GSFC), J. Nousek (PSU), N. Gehrels (GSFC), on behalf of the \nSwift UVOT team.\n\nThe Swift Ultra-Violet/Optical Telescope (UVOT) began observations of \nGRB050215b (GCN 3024) on February 15, 2005 at 02:35:10 UT.  We detect no \nsource down to a magnitude of 19.5 in the V-filter for a 100 second \nexposure 1747s after the BAT trigger.  No source was detected in the other \nUVOT filters.  The limiting magnitudes in each of the UVOT filters are as \nfollows:\n\n  UVW2 = No source identified down to 19.2 (3-sigma) for a 10 second \nexposure @ 88 seconds after the burst\n  UVM2 = No source identified down to 21.3 (3-sigma) for a 100 second \nexposure @ 1853 seconds after the burst\n  UVW1 = No source identified down to 20.2 (3-sigma) for a 100 second \nexposure @ 1959 seconds after the burst\n  U = No source identified down to 19.8 (3-sigma) for a 100 second exposure \n@ 2065 seconds after the burst\n  B = No source identified down to 19.9 (3-sigma) for a 100 second exposure \n@ 2171 seconds after the burst\n  V = No source identified down to 19.5 (3-sigma) for a 100 second exposure \n@ 1747 seconds after the burst\n\nWe caution that the instrument is not yet fully calibrated and that the \nmagnitude limits presented here may need to be refined at a future date.",
  "circularId": 3026,
  "createdOn": 1108457040000,
  "email": "roming@astro.psu.edu",
  "subject": "GRB050215b: No Swift UVOT Detection of Afterglow Emission",
  "submitter": "Pete Roming at PSU  <roming@astro.psu.edu>",
  "eventId": "GRB 050215B"
}