TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  1580
SUBJECT: GRB 021004, optical observations
DATE:    02/10/05 15:21:16 GMT
FROM:    Umit Kiziloglu at Middle East Tech.U,Phys.Dept  <umk@astroa.physics.metu.edu.tr>

S. Balman (METU), H.Esenoglu (IU), M.Parmaksizoglu (TUG),
Z. Aslan (TUG), U. Kiziloglu (METU)
report on behalf of a larger collaboration (TUG, IKI, KSU):

We have observed the optical transient (OT) of GRB 021004 (GCN #1564,
1565, 1568) with the 1.5m RTT150 telescope of TUG (TUBITAK National
Observatory, Turkey) on Bakirlitepe between 19:30 and 20:30 UT on Oct 4 2002.

We find:

UT start   exp_tim   band  magnitude
 19:48:09   900 s    R     17.82+-0.03
 20:08:25   600 s    I     17.18+-0.04
 20:20:19  1200 s    V     18.19+-0.11

using USNO-A2 magnitude estimates. Analysis of the full data set is underway.

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