TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1403 SUBJECT: GRB020531(=H2042): Optical Observations DATE: 02/06/01 00:08:19 GMT FROM: Don Lamb at U.Chicago D. Q. Lamb, S. Snedden, D. E. Vanden Berk, S. Allam, D. L. Tucker, B. C. Lee, M. Harvanek, A. N. Kleinman, S. Kleinman, J. Krzesinski, D. Long, and P. R. Newman, on behalf of the SDSS GRB team, report: "Visual comparison of one 600 second r'-band image (41.5' x 41.5' field of view) covering more than 90% of the IPN error box (GCN 1402) for GRB020531 (=H2042) (GCN 1399), which was taken using the SDSS 0.5-m "Photometric Telescope" (PT) at APO less than 4.5 hours after the burst (GCN 1401), and the UK Schmidt second epoch Southern Survey (emulsion IIaf) plate for this region (taken at 1993.389) shows no new object brighter than the limiting magnitude of the UK Schmidt plate, which is R ~ 20.5." This message is citeable