GCN Circular 7262
Subject
GRB 080205 optical upper limit
Event
Date
2008-02-06T14:46:31Z (19 years ago)
From
AAVSO GRB Network at AAVSO <matthewt@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.