{
  "bibcode": "2003GCN..1885....1G",
  "body": "P. Garnavich (Notre Dame), K. von Braun (DTM), K. Stanek (CfA)\n\nWe have calibrated the R-band images of the GRB 030226 field\n(Fox et al. GCN 1879; von Braun et al. GCN 1881) taken\nwith the 1-m Swope telescope on Feb. 26 (UT). The Landolt\nstandard field PG1323-086 (Landolt 1992, AJ, 104, 340) was\nobserved at the end of the photometric night. We estimate the\nfollowing magnitudes for stars near the optical afterglow:\n\nStar A  11:33:03.214  +25:51:30.73 (2000)  R=15.39 +/-0.05\nStar B  11:32:59.808  +25:52:38.73 (2000)  R=17.06 +/-0.05\n\nwhere most of the error is due to the uncertain airmass correction.\nStar A was noted in GCN 1881 as having a USNO magnitude of 15.0.\n\nUsing this calibration we find the following brightness for\nthe afterglow from the Swope data:\n\nFeb. 26.305 (3.5 hours after the burst)  R=18.44 +/-0.05\n\nThe images show only a 0.02 mag variation in the\nbrightness of the afterglow over a 20 minutes span.\n\nA finder chart for the afterglow and calibrated stars\ncan be found at: http://www.nd.edu/~pgarnavi/grb030226.jpg\n\nThis message may be cited.",
  "circularId": 1885,
  "createdOn": 1046287035000,
  "email": "pgarnavi@miranda.phys.nd.edu",
  "subject": "GRB 030226, optical observations",
  "submitter": "Peter Garnavich at U of Notre Dame  <pgarnavi@miranda.phys.nd.edu>",
  "eventId": "GRB 030226"
}