GCN Circular 7262
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.