{
  "bibcode": "2009GCN..9351....1K",
  "body": "N. P. M. Kuin (MSSL/UCL), S. Oates (MSSL/UCL), M. De Pasquale (MSL/UCL),\nE.A. Hoversten (PSU), and F. Marshall (GSFC) report on behalf of the\nSwift UVOT team.\n\nThe Swift UltraViolet/Optical Telescope (UVOT) continued observations of\nthe short hard burst GRB 090510 (Swift BAT trigger number 351588;\nHoversten et al. GCN Circ. 9331) today. The summed image in the white\nfilter taken between 92.7ks and 127.6 ks shows that the source has faded\nfrom the initial magnitude of wh = 18.76 mag at T+800 and is now possibly\ndetected at 3.3 sigma at a magnitude of 22.9+/-0.3.  Observations between\nT+2000s and T+100ks show a decay index of about 1.  There are also two\nnearby sources at the 6 sigma level detectable, which we consider to be\npossible hosts of GRB 090510.\n\nThe first, nearest, candidate is at  position RA, DEC = 333.55220, -26.584525\n(22h 14m 12.53s, -26d 35m 04.29s (J2000)), with a diameter of 2.3\", and the\nsecond, more extended, candidate is found at position  RA, DEC =\n333.54963, -26.582294 (22h 14m 11.91s, -26d 34m 56.26s (J2000)), is more\nelongated with a diameter of about 3.1\". The estimated positional accuracy\nis 0.7\" for both sources. Both sources have a wh magnitude of 21.61 +/- 0.17.\n\nWe encourage follow-up observations.\n\nWe would like to make a correction:  The UVOT positional error on GRB 090510\nquoted in GCN 9342 was too large. The correct uncertainty in the GRB position\nwas 0.61\" (90% confidence radius).",
  "circularId": 9351,
  "createdOn": 1242085850000,
  "email": "npkuin@googlemail.com",
  "subject": "GRB 090510: Swift/UVOT host galaxy candidates",
  "submitter": "Paul Kuin at MSSL  <npkuin@googlemail.com>",
  "eventId": "GRB 090510"
}