TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3515 SUBJECT: GRB050603, submillimetre observations DATE: 05/06/03 20:23:59 GMT FROM: Vicki Barnard at Joint Astro.Centre,Hawaii V. Barnard, G. Schieven, R. Tilanus, E. Lundin (all Joint Astronomy Centre), R. Ivison (Astronomy Technology Centre, Royal Observatory Edinburgh) report on behalf of the JCMT afterglow collaboration: We have observed the field of the afterglow of GRB050603 as reported in GCN 3511 with SCUBA at the JCMT. SCUBA operates simultaneously at 450 and 850 microns and has a field of view of approximately 2.3 arcmin. In moderate weather conditions, the initial results are: 850 micron: 2.408 +/- 1.973 mJy 450 micron: -41.97 +/- 94.988 mJy These observations began at 20050603.738 UT and ended at 20050603.823 UT.