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GCN Circular 6199

GRB 070311: MDM Optical Follow-up
2007-03-12T16:59:07Z (17 years ago)
Jules Halpern at Columbia U. <>
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

This message may be cited"
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