GRB021004 OT observations from Nyrölä Observatory

This CCD image of the GRB021004 Optical afterglow has been composed from 29 four minute exposures totaling 6960 seconds taken October 4/5, 2002 22:23-01:06 UT through Rc filter.

Copyright: Nyrölä Observatory, 2002

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.

NUMBER:  1591
SUBJECT: GRB021004, Optical Observations
DATE:    02/10/06 17:59:20 GMT
FROM:    Arne A. Henden at USNO/USRA  

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 1564) for GRB021004 (Shirasaki et al.,
GCN 1565; Doty et al., GCN 1568) 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.


The combined fits frames are available on: