TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  1584
SUBJECT: GRB021004, Optical Observations
DATE:    02/10/05 20:39:28 GMT
FROM:    Richard J. Cool at U of Wyoming  <riccool@uwyo.edu>

R. J. Cool, J. J. Schaefer (University of Wyoming) reporting on behalf of 
the University of Wyoming GRB Response Team under the direction of R. 
Canterna:

We observed the optical afterglow of GRB 021004 (GCN #1564) with the 
Red Buttes Observatory 0.6 meter telescope, operated through the 
University of Wyoming, between 4:37 UT and 6:25 UT on October 5 2002.  
All observations were completed in the R-band under unfavorable
conditions. 

We find R-band magnitudes for two epochs:

     UT          R_mag
     ====================== 
     04:52:36   19.14
     06:20:25   19.23

Typical errors on these values are +/- 0.1 mag.  Calibration was completed 
assuming the USNO star from Weidinger (GCN #1573) has an R magnitude of 
15.64.  Further analysis and observations are scheduled in the coming 
days.


This message may be cited.

Richard Cool
University of Wyoming
307/766-8918
riccool@uwyo.edu