{
  "bibcode": "2009GCN..9338....1O",
  "body": "G. Olofsson, M. Ergon (Univ. Stockholm), D. Malesani, J.P.U. Fynbo \n(DARK/NBI), P. Jakobsson (Univ. Iceland), N.R. Tanvir, K. Wiersema \n(Univ. Leicester), A.J. Levan (Univ. Warwick), report on behalf of a \nlarger collaboration:\n\nWe observed the field of short Swift/Fermi GRB 090510 (Hoversten et al., \nGCN 9331; Ohno & Pelassa, GCN 9334; Guiriec et al., GCN 9336) with the \nNordic Optical Telescope equipped with ALFOSC. Observations were carried \nout in twilight and at high airmass (~3).\n\nThe candidate afterglow (Marshall & Hoversten, GCN 9332) is clearly \ndetected in a stack of our images taken at a mean epoch May 10.215 UT \n(4.7 hr after the GRB). Calibrating against closeby USNO stars (R1 \nmagnitudes), we get R ~ 21.2. Comparing this value with the magnitude \nreported by Marshall & Hoversten (GCN 9332) indicates fading, thus \nconfirming that this object is the afterglow of GRB 090510.\n\nAstrometry of the field yields the following coordinates for the \nafterglow (0.4\" error):\n\nRA(J2000) = 22:14:12.64\nDec(J2000) = -26:35:02.8\n\nwhich is consistent with the UVOT position. We note the presence of a \nfainter source ~1\" East of the afterglow. A finding chart is posted at \nthe following URL:\n\nhttp://www.astro.ku.dk/~malesani/GRB/090510/090510_finder.png\n\nWe acknowledge the observiers at the NOT for carrying out this difficult \nobservation.\n\n[GCN OPS NOTE(10may09): The authors point out that there is a correction\nto the coordinates given above (see GCN Circ 9340).]",
  "circularId": 9338,
  "createdOn": 1241951419000,
  "email": "malesani@astro.ku.dk",
  "subject": "GRB 090510: NOT afterglow confirmation",
  "submitter": "Daniele Malesani at Dark Cosmology Centre, Niels Bohr Inst  <malesani@astro.ku.dk>",
  "eventId": "GRB 090510"
}