{
  "bibcode": "2000GCN...668....1S",
  "body": "K. Z. Stanek (CfA), P. M. Garnavich (Notre Dame), P. J. Groot, S. Jha\n(CfA) and M. Hicks (JPL) report:\n\nWe have observed most of the RXTE/ASM-IPN error-box of GRB 000508B\n(GCN 665) using the FLWO 1.2-meter telescope on Mt. Hopkins and the\nKPNO 2.1m telescope. The center of the GRB 000508B error-box is\nlocated at Galactic coordinates (l,b)=(0.48 deg,14.38 deg), and the\nSchlegel et al. (1998) Galactic reddening toward this direction is\nE(B-V)=0.51 (A_V=1.7 mag). Due to the proximity to the Galactic plane\nthe stellar field is fairly dense.\n\nAt KPNO we obtained four 600 sec R-band images, the first two at UT\nMay 10 07:30 and the second two at UT May 10 11:33. At FLWO we\nobtained two 600 sec R-band images, first one at UT May 10 06:39 and\nthe second one at UT May 10 09:14. In addition, at FLWO we have\nobtained UBVI images for the field. Using DAOPHOT-II (Stetson 1992) on\nthe FLWO 1.2-meter R-band image we detect about 5,000 objects with\nR<22.5 in 11x11 arcmin field.\n\nVisual comparison with the POSS-II red plate reveals no obvious\n``new'' objects. Employing the image subtraction code ISIS-2 (Alard\n1999) between the two epochs taken at each telescope reveals four\npossible variable objects located in the error-box, with the following\ncoordinates and magnitudes from Henden et al. (GCN 667):\n\nV1) RA=253.58616  DEC=-20.41683  V=16.75\n\nV2) RA=253.54913  DEC=-20.46479  V=17.33\n\nV3) RA=253.53600  DEC=-20.43531  V=17.72\n\nV4) RA=253.60865  DEC=-20.42111  V=18.24\n\nAll of these objects are easily identified on the POSS-II plate, so\nmost likely NONE of these objects is the optical counterpart to GRB\n000508B. Further observations are planned at FLWO.\n\nThis message can be cited.",
  "circularId": 668,
  "createdOn": 957999430000,
  "email": "kstanek@cfa.harvard.edu",
  "subject": "GRB000508B, optical photometry",
  "submitter": "Krzysztof Z. Stanek at CfA  <kstanek@cfa.harvard.edu>",
  "eventId": "GRB 000508B"
}