[vsnet-grb-info 2341] GRB051028: optical observations

[GCN Circulars]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  4178
SUBJECT: GRB051028: optical observations
DATE:    05/10/29 17:37:08 GMT
FROM:    Patrizia Ferrero at TLS Tautenburg  <ferrero at tls-tautenburg.de>

P. Ferrero, D. A. Kann, S. Klose, and C. Hoegner, Thueringer
Landessternwarte Tautenburg,

report:


We observed the entire error box of GRB 051028 (HETE trigger 3951;
Hurley et al. 2005, GCN 4172) with the 1.34-m Tautenburg Schmidt
telescope equipped with the prime focus CCD camera on October 28,
2005. Sky conditions were very good.

We obtained 6x180s I-band images (mean time Oct. 28.716 UT), 6x180s
R-band  images (mean time Oct. 28.739 UT), 6x180s V-band images (mean
time Oct.  28.77 UT) and a final set of 60x180s I-band images (mean
time Oct. 28.898 UT), corresponding to 3.58, 4.12, 4.88 and 7.94
hours after the burst, respectively.

In our stacked images we clearly detect the afterglow candidate
(Jelinek et al. 2005, GCN 4175; Pandey et al. 2005, GCN 4176) in all
bands.

A preliminary estimation of the afterglow magnitude on the first six
co-added I-band images gives I~19, in comparison with the USNOB.1
star 1377-0047752 at R.A. (J2000)=01h 48m 15.974s and Decl.=+47d 45' 02.34"
(Monet et al. 2003).

Further analysis is in progress.


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