{
  "bibcode": "2002GCN..1585....1H",
  "body": "GRB 021004: Optical Photometry at 1.5 Days\n\nS. Holland (Notre Dame), J. P. U. Fynbo, M. Weidinger (Aarhus)\nM. P. Egholm (NOT), and A. Levan (Leicester)\non behalf of a larger collaboration report:\n\n     We have obtained deep R-band images of the field containing\nGRB 021004 using the 2.56-meter Nordic Optical Telescope on La Palma\non Oct. 6.0 UT.  The optical afterglow of GRB 011211 is visible in our\nimages.  Using the comparison star from Fox et al. (2002, GCN 1564)\nand the calibration of Henden (2002, GNC 1583) we find the following\npreliminary magnitudes:\n\n          Date       UT     t(days)   Rc   Err\n          -------------------------------------\n          Oct. 5  20:24:58   1.346   19.54 0.04\n          Oct. 5  20:36:28   1.354   19.53 0.04\n          Oct. 5  22:22:31   1.428   19.62 0.05\n          Oct. 6  00:10:41   1.503   19.66 0.04\n\n     These magnitudes imply that the optical afterglow faded at a rate\nof alpha = -1.08 during the four hours that these observations were\ntaken.  Combining these magnitudes with those of Weidinger et al.\n(2002, GCN 1573) suggests that the optical afterglow has decayed with\na constant slope of alpha = -1.01 between 0.09 and 1.50 days after the\nburst.  A plot of our preliminary Rc-band light curve is available at\n<http://www.nd.edu/~sholland/grb/grb021004/lightcurve1.eps>.\n\nThis message may be cite",
  "circularId": 1585,
  "createdOn": 1033871376000,
  "email": "sholland@nd.edu",
  "subject": "GRB 021004: Optical Photometry at 1.5 Days",
  "submitter": "Stephen Holland at U. of Notre Dame  <sholland@nd.edu>",
  "eventId": "GRB 021004"
}