TITLE: GCN GRB OBSERVATION REPORT NUMBER: 98 SUBJECT: GRB971214 Secondary Standards DATE: 98/06/05 23:52:32 GMT FROM: Arne A Henden at USNO/USRA The U. S. Naval Observatory GRB team (A. A. Henden, C. B. Luginbuhl, F. J. Vrba, B. Canzian, S. E. Levine, H. H. Guetter, J. A. Munn) report follow up optical photometry of the secondary standards (see Henden, et. A. GCN 16) in the field of GRB971214. The observations were made on four photometric nights since the burst with the USNO 1.0m telescope. Johnson-Cousins BVRI filters were used, with an average of 50 Landolt standards of wide color range and extinction observed on each night. The transformations are accurate to 0.01-0.02mag per single observation. DAOPHOT psf fitting was used in the GRB field, with magnitude corrections to adjust the photometry to a standard aperture diameter. Given below is the photometry, with errors based on the variance between the four nights. More detail, including coordinates and comparisons between other published values for these stars, can be found next week on our Web site at: http://psyche.usno.navy.mil/nofs/grb/grb971214.html For further information contact A. A. Henden at aah@nofs.navy.mil or by telephone at (520) 779-5132. This GCN note can be cited. ID B err V err R err I err ------------------------------------------------------------ 1 17.676 0.026 16.849 0.022 16.378 0.006 15.971 0.011 2 22.636 0.177 21.142 0.029 20.123 0.061 18.629 0.105 3 23.337 0.329 21.641 0.221 20.462 0.055 18.959 0.053 4 23.019 0.287 21.501 0.152 20.573 0.041 19.321 0.053 5 19.418 0.031 18.069 0.039 17.194 0.016 16.382 0.041 6 15.423 0.018 14.790 0.037 14.431 0.025 14.117 0.069 7 19.934 0.081 18.298 0.036 17.270 0.014 15.971 0.011 8 16.490 0.031 15.871 0.025 15.478 0.032 15.139 0.031 9 21.341 0.056 19.913 0.035 18.970 0.040 17.991 0.053