{
  "bibcode": "2000GCN...611....1V",
  "body": "The candidate for the optical transient (OT) associated with the gamma \nray burst GRB000301C has been observed in imaging mode with OSIS on \nthe 3.6-m CFH Telescope in the course of the French GRB follow-up \nprogram at CFHT (M. Boer, CESR, C. Veillet, CFHT). \n\nThe OT has the following magnitude, using star A (GCN573) photometry \n(GCN583): \n\nR = 23.82 +/- 0.10   2000 March 14.60 (UTC) \n(two 30mn exposures) \n\nB = 24.83 +/- 0.12   2000 March 14.60 (UTC) \n(one 55mn exposure) \n\nThe power-law decay described with alpha = -2.1 +/- 0.1 (GCN610) is not\nsufficient to account properly for the last four measurements (GCN598, \n604, 610 and this GCN), which are better fit with alpha = -2.7 +/- 0.1 . \nThe first phase of the decay would cover the first four days after the \nburst, with alpha = -0.91 +/- 0.08. A graph with these two consecutive \npower laws, as well at the new images, are at \nhttp://www.cfht.hawaii.edu/~veillet/grb.html \n\nAs for the apparent B-R, the error bars are large enough to make it close \nto the value determined using MOS on March 3.5 (0.86 +/- 0.06) or the one \npublished by Halpern (0.77 +/- 0.06 in GCN585 a week ago). \n\nAs the GRB is still steadily decaying, it's unlikely to have the underlying\ngalaxy contributing significantly to the measured flux. This galaxy should \nprobably be fainter than R = 24.5, confirming the comment by Fruchter et al. \n(GCN602) from HST imaging data (R >~ 24). \n\nA 20 micron camera will be installed on the telescope today for 10 nights. \nNo new data on this GRB will be acquired during this period. \n\nAloha from Hawaii! \n\nI. Gable is acknowledged for his help in this observation. \n\nThis message may be cited. \n-- \n************************************************************\nDr. Christian Veillet,       CFHT Senior Resident Astronomer\nPhone: (808) 885-3161   http://www.cfht.hawaii.edu/~veillet/\n************************************************************",
  "circularId": 611,
  "createdOn": 953078230000,
  "email": "veillet@cfht.hawaii.edu",
  "subject": "GRB000301C - B and R photometry",
  "submitter": "Christian Veillet at CFHT  <veillet@cfht.hawaii.edu>",
  "eventId": "GRB 000301C"
}