{
  "bibcode": "2008GCN..8298....1K",
  "body": "N. P. M. Kuin (MSSL/UCL), T. Sakamoto (NASA/UMBC),and Stephen\nHolland (GSFC) report on behalf of the Swift UVOT team\n\nThe Swift UltraViolet/Optical Telescope (UVOT) began observations of\nGRB080928 (Swift BAT trigger number 326115, Sakamoto et al., GCN Circ.\n8292), on September 28, 2008, at 15:04:15 UT, 161 seconds after the\ntrigger with a setling exposure in the UVOT v filter.\n\nWe detect a new source at position :\n\nRA=06:20:16.836 Dec=-55:11:58.95  (95.07015, -55.199708 deg (J2000)),\n\nwith an estimated uncertainty of 0.5 arcsec (radius, 90% confidence).\n\nThe initial magnitude observed for GRB080928  is given below for the\nfirst observation in the UVOT v filters:\n\nFilter Tstart(s) Tstop(s)  Exp(s)  Magnitude\n\nwh(fc)  179      279       99.8    19.09 +/- 0.14  7.3-sigma\nv (fc)  285      479      193.7    19.07 +/- 0.43  2.5-sigma\nuvm2   4227     4427      196.6   >19.47 3-sigma upper limit (weak signal)\nuvw1   4432     4632      196.6    18.64 +/- 0.19  5.6-sigma\nu      4638     4838      199.8    17.96 +/- 0.09 12.1-sigma\nb      4843     5043      199.8    18.40 +/- 0.09 11.9-sigma\nuvw2   5255     5455      196.6   >19.89 3-sigma upper limit\nv      5460     5660      199.8    18.03 +/- 0.15 7.3-sigma\n\nThe upper limits in the UV filters uvw2 and uvm2 indicate an\nupper limit to the redshift of z < 1.8. An initial rise is seen\nup to about 200s in the white filter event data.\n\nThe values quoted above are on the UVOT Photometric System\n(Poole et al, 2008, MNRAS 383,627). They are not corrected for the\nexpected galactic reddening of E(B-V) = 0.067 in the direction of\nthe burst (Schlegel et al. 1998).",
  "circularId": 8298,
  "createdOn": 1222692856000,
  "email": "npkuin@googlemail.com",
  "subject": "GRB 080928: Swift/UVOT observations",
  "submitter": "Paul Kuin at MSSL  <npkuin@googlemail.com>",
  "eventId": "GRB 080928"
}