GCN Circular 3907
Subject
GRB 050824: MDM Observations
Event
Date
2005-09-02T18:31:11Z (20 years ago)
From
Jules Halpern at Columbia U. <jules@astro.columbia.edu>
J. P. Halpern (Columbia U.) and N. Mirabal (U. Michigan) report on behalf of
the MDM Observatory GRB follow-up team:
"We observed the Swift GRB 050824 afterglow (Gorosabel et al., GCN #3865)
in the R band on five consecutive nights using the MDM 1.3m telescope.
Photometry was established using two Landolt standard-star fields on one
photometric night. From 5.6 to 12.6 hours, the decay is consistent with
a power law of index -0.55+/-0.05, which extrapolates well to the MASTER
photometry at 24 and 47 minutes (Lipunov et al., GCN #3883). This decay
index is similar to that seen in the Swift XRT light curve, -0.4+/-0.2
(Campana et al., CGN #3877), immediately preceding the MDM observations.
An unobserved inflection in the optical light curve then occurs, and from
1.3 to 4.4 days the decay index is -0.43+/-0.04. Our final measured point
is R=22.18+/-0.06 on Aug. 29.32.
Images and light curves are posted at
http://www.astro.columbia.edu/~jules/grb/050824/
This message may be cited."