{
  "bibcode": "2005GCN..3745....1M",
  "body": "K. McGowan (UCL-MSSL), A. Morgan (PSU), K. Mason (PPARC),\nT. Kennedy (UCL-MSSL) report on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began observing the afterglow of\nGRB 050802 at 2005-08-02T10:15:14, 286 s after the\nBAT trigger (Band et al., GCN 3734).  In addition to our\nreported detection from the initial V filter observations\n(McGowan et al., GCN 3739), we now report that we detect\nthe afterglow in all six filters.\n\nWe extracted data using a 6 arcsec radius aperture\ncentered on the source position (McGowan et al., GCN 3739)\nfor the optical filters, a 12 arcsec radius for the W1 and\nM2 filters, and 4 arcsec for the W2 filter.  If the\nsignificance of the source detection was less than 2 sigma\nwe determined a 3-sigma limiting magnitude.\n\nThe detection in UVW2 implies that the Lyman Limit must be blueward\nof 2000 A, and we estimate that the burst is at redshift z < 1.2.\n\nWe obtain the following photometry of the afterglow candidate:\n\nFilter   Exposure (s)  T_mid (s)   Magnitude      Notes\n\nV        100           336         17.07+/-0.09   detection\nV        900           12566       20.35+/-0.09   detection\n\nB        10            437         17.66+/-0.20   detection\nB        900           36405       21.10+/-0.08   detection\n\nU        10            423         16.82+/-0.24   detection\nU        899.79        35498       20.22+/-0.16   detection\n\nW1       10            409         17.08+/-0.29   detection\nW1       100           2296        19.22+/-0.23   detection\n\nM2       278           1316        18.79+/-0.26   detection\nM2       3753          28197       21.30+/-0.26   detection\n\nW2       268           1240.5      20.73+/-0.27   detection\nW2       3481          25890.5     >22.64         3-sig limit\n\nwhere T_mid is the midpoint of the exposure post-trigger in seconds.\n\nThe magnitudes are based on preliminary zero points, measured in\norbit, and will require refinement with further calibration.",
  "circularId": 3745,
  "createdOn": 1123083429000,
  "email": "km2@mssl.ucl.ac.uk",
  "subject": "GRB 050802: Swift/UVOT optical and UV detections",
  "submitter": "Katie McGowan at MSSL-UCL  <km2@mssl.ucl.ac.uk>",
  "eventId": "GRB 050802"
}