{
  "bibcode": "2002GCN..1654....1B",
  "body": "E.A.Barsukova (SAO), V.P.Goranskij (Sternberg Institute),\nG.M.Beskin (SAO), V.L.Plokhotnichenko (SAO), A.S.Pozanenko  (IKI).\n\nWe have observed GRB 021004 on October 8, 2002 four days after the burst,\nusing 1-m Zeiss telescope and CCD with Rc filter under good seeing\nconditions. Five 20-min exposures were taken in the time interval between\n20:49:56 and 22:35:14 UT. Object is seen near the frame limit in each of\nthese frames. The photometry and astrometry of images were performed. The\nsum of all frames (total exposure is 100 minutes) gives the magnitude of OT\n\nRc = 20.9 +/- 0.3\n\nrelative to comparison star by Fox (GCN 1564) with Henden's (GCN 1630)\ncalibration magnitude of 15.538 Rc.\n\nThe astrometry of all the frames taken both on October, 4 (GCN 1606) and\nOctober, 8 shows that the image of the object is displaced by 0\".5 West on\nOctober, 8 relative to that on October, 4. The accuracy of the astrometry is\n0\".2. One may suggest that the displacement results from influence of a host\ngalaxy.\n\nThis message may be cited.",
  "circularId": 1654,
  "createdOn": 1035553487000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 021004: optical observations",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 021004"
}