TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1581 SUBJECT: GRB 021004: optical counterpart DATE: 02/10/05 16:08:46 GMT FROM: T.P. Prabhu at Indian Astro. Obs. D.K. Sahu, B.C. Bhatt, T.P. Prabhu (Indian Institute of Astrophysics, Bangalore) report on behalf of a larger collaboration: We have observed the optical afterglow of GRB021004 with the 2-m Himalayan Chandra Telescope, Indian Astronomical Observatory, Hanle. Preliminary magnitude estimates in R band using the USNO star (GCN #1564) with R=15.3 are: October 4 R 16:41 UT 17.11 22:47 UT 18.26 [GCN OPS NOTE (05oct02): This submission was received at 05:30 05 Oct 02 UT, but was delayed in distribution due to the lack of an entry in the vetting list. A new entry was added and the submission manually invoked.]