GCN Circular 1591

Subject

GRB021004, Optical Observations

Event

Date

2002-10-06T17:59:20Z (23 years ago)

From

Arne A. Henden at USNO/USRA <aah@nofs.navy.mil>

Arto Oksanen (Nyrola), Mika Aho (Nyrola), Kevin Rivich (Ft. Bend),
Kim Rivich (Ft. Bend), Doug West (West Skies),
and Doug Durig (Cordell-Lorenz) report on behalf of the AAVSO
International GRB team:

We have observed the optical afterglow candidate
(Fox et al., GCN 1564Loading...
 
 ) for GRB021004 (Shirasaki et al.,
GCN 1565Loading...
 
 ; Doty et al., GCN 1568Loading...
 
 ) from multiple observatories.
The preliminary photometric reductions are given below;
these measures will be improved, but indicate the
datasets that are currently available:

   Date     UT  sec x n  fil  Site           mag
  021004  19:53  60x22   Rc  Nyrola   0.4m  17.90
  021004  21:24  120x10  Rc  Nyrola   0.4m  17.96
  021004  21:48  120x11  Rc  Nyrola   0.4m  18.22
  021004  22:25  240x9   Rc  Nyrola   0.4m  18.37
  021004  23:26  240x10  Rc  Nyrola   0.4m  18.41
  021004  00:13  240x10  V   Nyrola   0.4m  19.25
  021005  01:04  240x10  Rc  Nyrola   0.4m  18.83
  021005  01:28  60x12   CR  West     0.2m  19.0
  021005  02:08  300x3   CR  Cordell  0.3m  19.0
  021005  04:43  20x60   Rc  Ft. Bend 0.9m  19.2

Where CR indicates unfiltered measures, zeropointed
onto the Rc system.  Further observations are in progress.

This report can be cited.