{
  "bibcode": "1999GCN...260....1V",
  "body": "Christian Veillet reports:\n\nThe optical transient (OT) associated with the gamma ray burst GRB990123\nhas been observed with the new wide field camera CFH12k at the prime focus\nof the 3.6-m CFH Telescope for two additional nights on 1999 Feb. 8.6 and\n9.6 by C. Veillet in the course of the French GRB follow-up program\nat CFHT (M. Boer, CESR, C. Veillet, CFHT) with the assistance of\nJ. Anderson (University of Victoria - Canada), as a continuation\nof the observations reported in GCN 253 from the three previous nights. \n\n\nUsing only the last three nights (image quality better than 1 arc-second),\nphotometric measurements in B, V and R using the star #18  published by \nNilakshi et al. (GCN 252) give the following results:\n\nR = 23.41 (0.1)  on 1999 Feb. 8.6  - 130 mn total integration time\nV = 24.05 (0.1)  on 1999 Feb. 8.6  -  50 mn total integration time\nB = 24.46 (0.15) on 1999 Feb. 9.6  -  30 mn total integration time\n\nThe V magnitude is in good agreement with the HST estimate\nof the OT+galaxy magnitude (V~24 GCN 255).\n\n\nAs suspected from the first published image based on the first three nights\n(GCN 253) with the first two of poor image quality, the surrounding galaxy \nis now clearly resolved.  A composite image in R and contour maps\nof the GRB area and of a nearby comparison star are available at the Web site\nhttp://www.cfht.hawaii.edu/~veillet/grb990123.html \n \n\nThis message may be cited.",
  "circularId": 260,
  "createdOn": 919431723000,
  "email": "veillet@cfht.hawaii.edu",
  "subject": "GRB990123 observations",
  "submitter": "Christian Veillet at CFHT  <veillet@cfht.hawaii.edu>",
  "eventId": "GRB 990123"
}