{
  "bibcode": "2000GCN...670....1J",
  "body": "GRB 000508B: Optical observations\n\nB. L. Jensen, H. Pedersen, J. Hjorth (U. of Copenhagen),\nJ. P. U. Fynbo (U. of Aarhus/ESO),\nJ. Gorosabel, N. Lund (DSRI,Copenhagen),\nH. Kjeldsen, F. Grundahl (U. of Aarhus),\nC. Zurita, J. Casares (IAC,Tenerife),\nC. Sanchez-Fernandez and A.J. Castro-Tirado (LAEFF, Madrid)\nreport on behalf of a larger European GRB collaboration:\n\n\"We have obtained images of the RXTE/IPN error box\nreported by Smith et al. (GCN #665) with the 2.56-m\nNordic Optical Telescope (NOT+ALFOSC) on La Palma,\nand the 1.54-m Danish Telescope (DK-1.54m+DFOSC) at\nLa Silla, as follows:\n\nTelescope      Date                  Filter/Exp t. FWHM\nNOT       2000 May 10.14 UT (t+32h); I:5x300s;     FWHM=0.8\"\nDK-1.54m  2000 May 10.17 UT (t+33h); R:3x420s;     FWHM=1.5\"\nDK-1.54m  2000 May 10.38 UT (t+38h); R:3x420s;     FWHM=1.5\"\nDK-1.54m  2000 May 12.25 UT (t+83h); R:4x420s;     FWHM=1.3\"\n\nWe have visually compared the combined May 10 2520s R-band\nimage with red POSS-II exposure. The three sets of May 10\nimages have been compared internally, both visually\nand using automated routines based on DAOPHOT II/ALLSTAR\nPSF-photometry. Additionally, we have compared the\ncombined May 10 and May 12 R-band images, visually and\nthrough automated routines. We do not, in any of the\ncomparisons, find any significantly variable objects\ndown to a 3-sigma mag limit of R~22.5. We do not find\nsignificant variability in the objects noted by Stanek\net al. (GCN #668). An image of the error-box is\nposted at http://www.astro.ku.dk/~brian_j/grb/grb000508B \"",
  "circularId": 670,
  "createdOn": 958514096000,
  "email": "brian_j@astro.ku.dk",
  "subject": "Re: GRB000508B : Optical observations",
  "submitter": "Brian Lindgren Jensen at U.of Copenhagen  <brian_j@astro.ku.dk>",
  "eventId": "GRB 000508B"
}