{
  "bibcode": "2008GCN..8603....1D",
  "body": "M. De Pasquale (MSSL/UCL) and A. Parsons (GSFC) reports, on the\nbehalf of the Swift UVOT team:\n\n  Swift UVOT began settled exposures of GRB081203A (trigger 336489,\nParsons et al, GCN circular 8595) 93 s after the burst trigger. A\nbright optical transient is detected at the following coordinates:\n\nRA = 15h 32m 07.58s (=233.031580), Dec = +63d 31m 14.9s (=63.520810) \nJ2000\n\n  with an uncertainty of 0.5'' (90% confidence level). This position is \nconsistent with the XRT refined error circle (Goad et al, GCN circ 8598).\n\n  The source is detected in all filters but um2. Below, we show time of \nobservations, the exposure time and the magnitude and 3 sigma upper\nlimits for this optical afterglow.\n\n\n\n       T_start (s)   T_stop (s)   Exp (s)        Mag\n\n  wh       93          242        146.2      14.53 +/- 0.01\n\n  wh      586          605        19.5       13.91 +/- 0.01\n\n\n  v       636          655        19.5       13.30 +/- 0.03\n\n\n  b       561          580        19.5       13.53 +/- 0.01\n\n\n  u       306          555         246       13.07 +/- 0.01\n\n  u       709          728         19.5      13.53 +/- 0.02\n\n\n  uw1     685          704         19.5      14.82 +/- 0.07\n\n\n  um2     660          679         19.5          > 17.57\n\n  um2     660         6008        412.6          > 20.1\n\n\n  uw2     611          630         19.5       17.19 +/- 0.25\n\n\n\n  The nondetection in the um2 filter is consistent with the\nredshift z=2.1 derived from grism spectra (Landsman et al, GCN\ncirc 8601). The detection in the uw2 filter is consistent with\nthis redshift due to the long-wavelength tail of the uw2\nfilter response.\n\n  The above magnitudes have not been corrected for the Galactic\nextinction corresponding to E(B-V) = 0.02 (Schlegel et al 1998)\nThe photometry is on the UVOT flight system described in Poole\net al (2008, MNRAS, 383,627)\n\n[GCN OPS NOTE(03dec08):  Per author's request, the \"A\" was added to the burst name.]",
  "circularId": 8603,
  "createdOn": 1228341987000,
  "email": "mdp@mssl.ucl.ac.uk",
  "subject": "Swift UVOT observations of GRB 081203A",
  "submitter": "Massimiliano de Pasquale at MSSL-UCL  <mdp@mssl.ucl.ac.uk>",
  "eventId": "GRB 081203A"
}