TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1570 SUBJECT: GRB021004: optical observations at Nyrola DATE: 02/10/04 22:10:45 GMT FROM: Arto Oksanen at Nyrola Obs., Finland A. Oksanen and M. Aho (Jyvaskylan Sirius ry) report on behalf of AAVSO International GRB Network: We have observed the optical afterglow of GRB021004 (HETE Trigger 2380) as reported by Fox et al. (GCN 1564) with the 16-inch Meade LX200 telescope of Nyrola observatory in Finland. Using the same R-band photometric zero-point as Fox et. al. (GCN 1564), we find object magnitude as Rc=17.7 at epoch of October 4, 2002 19:52 UT. Further observations and image calibration is in progress. This message may be cited.