Columbia University Astronomy and 

MDM Observatory GRB Team

GRB 991208: R-band CCD image, MDM 2.4m
1999 Dec. 13.53, 10 minute exposure

R-band image

GCN Circular #458: GRB 991208, Optical Observation
J. P. Halpern & D. J. Helfand (Columbia U.) report on behalf of the
MDM Observatory GRB follow-up team:

"We imaged the field of GRB 991208 in the R band on Dec. 13.53 UT
using the MDM 2.4m telescope.  A single 10 minute exposure was
obtained in non-photometric conditions.  The seeing was 1.1 arcseconds.
The afterglow was detected at R = 20.92 +/- 0.06, referenced to the
comparsion star quoted in GCNs 454 and 456 as having R = 15.9.
The decay index between our measurement and that of Garnavich &
Noriega-Crespo one day earlier (GCN 456) is -1.9 +/- 0.4.

This message may be cited."

Jules Halpern
David Helfand

Columbia University Astronomy and Astrophysics and MDM Observatory

MDM Observatory