{
  "bibcode": "2008GCN..8095....1H",
  "body": "S. T. Holland (CRESST/USRA/GSFC) & K. L. Page (U Leicester) report on\nbehalf of the Swift/UVOT team:\n\n      The Swift/UVOT observed the field of GRB 080810 starting 65 s\nafter the BAT trigger (Page et al., GCNC. 8080).  Settled observations\nstarted at T + 85 s.  We detect the optical afterglow (Page et al.,\nGCNC 8080) in the v, b, and white filters at the UVOT-enhanced\nlocation of the XRT afterglow (Evans et al., 2008, GCNC 8086).  The\nrefined UVOT source position is\n\n RA (J2000.0) =  23:47:10.48\nDec (J2000.0) = +00:19:11.3\n\nwith an estimated uncertainty of +/-0.6 arcsec (radius, 90%\nconfidence).  This is consistent with the positions of the optical\nafterglow reported by Rykoff (GCNC 8084) and de Ugarte Postigo (GCNC\n8089)\n\n    Magnitudes and upper limits are reported below.\n\nFilter     T_start (s) T_stop  Exposure      Mag  Err  Comment\nwhite           85        185        98     14.63 0.07\n   v            191        459       264     14.06 0.06\n   b           4432       4632       197     17.85 0.08\n   u           4227     68,686       727    >21.4       3-sigma UL\n  uvw1         4022     68,283      3099    >22.3       3-sigma UL\n  uvm2         3817     62,540      3229    >22.2       3-sigma UL\n  uvw2         4843     50,866      1510    >22.0       3-sigma UL\n\nThe above magnitudes are not corrected for the Galactic extinction\ncorresponding to a reddening of E_{B-V} = 0.03 mag (Schlegel et al.,\n1998, ApJS, 500, 525).  The photometry is on the UVOT photometric\nsystem described in Poole et al. (2008, MNRAS, 383,627).  The\nnon-detections in the u, uvw1, uvm2, and uvw2 filters are consistent\nwith a redshift of z = 3.35 (Prochaska, GCNC 8083).  The power-law\ndecay index in the b band between 4532 and 27,387 s is -1.29 +/- 0.22.\n\n[GCN OPS NOTE(10sep08): Per author's request, the RA value\nwas changed from 23:47:10.26\" to \"23:47:10.48\".]",
  "circularId": 8095,
  "createdOn": 1218475917000,
  "email": "sholland@milkyway.gsfc.nasa.gov",
  "subject": "GRB 080810: Swift/UVOT Refined Analysis",
  "submitter": "Stephen Holland at USRA/NASA/GSFC/SSC  <sholland@milkyway.gsfc.nasa.gov>",
  "eventId": "GRB 080810"
}