{
  "bibcode": "2005GCN..4041....1H",
  "body": "S. D. Hunsberger (PSU), F. Marshall (GSFC), S. T. Holland (GSFC),\nP. Brown (PSU), A. Morgan (PSU), P. Roming (PSU), and\nA. Cucchiara (PSU) on behalf of the Swift/UVOT teams\n\nThe UVOT began observing GRB050922C at 19:57:41UT, 111 seconds\nafter the BAT trigger (Norris et al., GCN 4013). A fading\noptical counterpart is detected at 21:09:33.0 -08:45:30.1. The\nafterglow is apparent in the UBV filters and there is a marginal\ndetection in UVW1 which is likely due to the redward edge of the\nfilter response overlapping the U bandpass. The UVOT magnitudes\nlisted below are not corrected for extinction. Tmid is the time\nsince trigger of the midpoint of the exposure(s).\n\n\nFilter    Tmid(s)     Exp(s)    Mag\nV         115.5       99.8      14.60 +- 0.10\nV         374.5        9.8      15.49 +- 0.17\nV         543.5        9.8      15.99 +- 0.21\nV         712.5        9.8      16.01 +- 0.21\nV        4543.5      899.8      17.62 +- 0.11\nV       15962.5      899.8      18.89 +- 0.21\nV       28443.5      899.8      19.95 is 3sigma upper limit\n\nB         261.5        9.8      15.88 +- 0.13\nB         430.5        9.8      16.36 +- 0.15\nB         598.5        9.8      16.45 +- 0.16\nB         767.0        8.4      16.91 +- 0.20\nB       11133.5      899.8      19.12 +- 0.11\nB       22648.5      899.8      20.13 +- 0.21\nB       39108.5      897.3      20.70 +- 0.38\nB       50681.5      899.8      20.74 +- 0.39\n\nU         246.5        9.8      15.09 +- 0.19\nU         416.5        9.7      15.69 +- 0.20\nU         584.5        9.8      15.84 +- 0.21\nU         753.5        9.7      16.00 +- 0.21\nU       10226.5      899.8      18.58 +- 0.18\nU       21749.0      900.0      19.13 +- 0.20\nU       34939.5      507.6      19.88 +- 0.31\nU       46660.0      814.1      19.89 +- 0.26\n\nUVW1      487.0       68.6      17.70 +- 0.29   (co-added 10s exposures)\nUVW1     6233.5      651.1      19.96 +- 0.41\nUVW1    17730.0      806.0      20.18 is 3sigma upper limit\n\nUVM2      473.0       68.5      18.86 is 3sigma upper limit (co-added)\nUVM2     5450.5      899.8      20.48 is 3sigma upper limit\n\nUVW2      487.5       58.8      19.30 is 3sigma upper limit (co-added)\nUVW2    11969.5      753.2      20.62 is 3sigma upper limit\n\nMagnitudes are based on preliminary zeropoints, measured in orbit, and\nmay require further refinement.",
  "circularId": 4041,
  "createdOn": 1127769183000,
  "email": "caryl@astro.psu.edu",
  "subject": "GRB050922C - Swift UVOT preliminary analysis",
  "submitter": "Caryl Gronwall at PSU/Swift-UVOT  <caryl@astro.psu.edu>",
  "eventId": "GRB 050922C"
}