[vsnet-grb-info 4418] GRB 070311: MDM Optical Follow-up

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  6199
SUBJECT: GRB 070311: MDM Optical Follow-up
DATE:    07/03/12 16:59:07 GMT
FROM:    Jules Halpern at Columbia U.  <jules at astro.columbia.edu>

J. P. Halpern & E. Armstrong (Columbia U.) report on behalf
of the MDM Observatory GRB follow-up team.

"We observed the afterglow of INTEGRAL GRB 070311 in the
R band for a second night using the MDM 1.3m telescope.
A combined 8x600 s image with mid-epoch Mar. 12 03:33 UT
yields R = 23.05 +/- 0.10 using the same comparison star
as in GCN 6195.  The corresponding power-law decay index
is -0.53 between 0.9 and 25.7 hours.  The seeing was ~1.7".
There is possible evidence for emission extending ~1.5"
to the west of the OT.  If so, it may contribute to the
shallow decay index.

MDM images are posted at

http://www.astro.columbia.edu/~jules/grb/070311/

This message may be cited"