[vsnet-grb-info 5600] GRB 080205 optical upper limit

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  7262
SUBJECT: GRB 080205 optical upper limit
DATE:    08/02/06 14:46:31 GMT
FROM:    AAVSO GRB Network at AAVSO  <matthewt at aavso.org>

Stefano Sposetti (Gnosca, Switzerland) reports to the AAVSO International 
High Energy Network the following optical observations of GRB080205 (GCN 
#7250, Markwardt et al.):

Stefano Sposetti reports an upper limit on the optical afterglow of 
GRB080205 reported by Li et al (GCN #7251).  The reported afterglow 
position was observed for a total of 7200 seconds using a 0.4-meter 
Newtonian with an SBIG ST8XE CCD and no filter.  Observations commenced on 
2008 February 05.74, approximately 9.5 hours after the Swift-BAT 
detection.  The afterglow was not detected, and an upper limit of CR=21.0 
was obtained with a S/N of 3, using USNO A2.0 magnitudes as comparisons. 
This upper limit is consistent with the R < 20 upper limit by Terra et al. 
(GCN #7260) at 2008 February 05.94, and the R = 23.5 detection at 2008 Feb 
05.96 by Rol et al. (GCN #7258).

A detailed report on these observations is available on the AAVSO website 
at ftp://ftp.aavso.org/grb/StefanoSposetti_GRB080205_2454502.86049_.txt

A fits image is available at
ftp://ftp.aavso.org/grb/StefanoSposetti_GRB080205_2454502.86049_.fits

The AAVSO thanks the Curry Foundation for their continued support of the
AAVSO International High Energy Network.