{
  "bibcode": "1999GCN...319....1P",
  "body": "G. Pietrzynski and A. Udalski (Warsaw University Observatory) report on\nbehalf of the OGLE microlensing survey team:\n\nObservations of the optical counterpart of GRB 990510 collected with the\n1.3-m Warsaw telescope at the Las Campanas Observatory (Chile) on  May\n11/12, 1999 indicate that the object faded smoothly to V=21.2 and I=20.3\non May 12.4 UT. \n\nSingle observation in the B-band collected on May 11.3607 UT yields the\nfollowing colors of the GRB990510 counterpart: B=20.47+/-0.05,\nB-V=0.54+/-0.06 and V-I=0.88+/-0.04. This indicates significantely\ndifferent spectral distribution as compared to regular stars.\n\nThe nearby galaxy, mentioned by Kaluzny et al 1999 GCN #314, is clearly\nvisible on collected frames. \n\nUpdated photometry of the optical counterpart of GRB 990510 and light\ncurves are available from the OGLE Internet archive: \n\nhttp://www.astrouw.edu.pl/~ftp/ogle\n\n\n[GCN OP NOTE (12May99):  Due to a problem in processing this Circular,\nthe NUMBER was erroneously assigned to be 318, when in fact it\nshould have been 319.  The archive copies have been fixed.]",
  "circularId": 319,
  "createdOn": 926513274000,
  "email": "udalski@sirius.astrouw.edu.pl",
  "subject": "GRB 990510, BVI photometry",
  "submitter": "Andrzej Udalski at Warsaw U. Observatory  <udalski@sirius.astrouw.edu.pl>",
  "eventId": "GRB 990510"
}