GCN Circular 6497
Subject
GRB 070611: ROTSE-III Detection of Late Rising Optical Counterpart
Date
2007-06-11T04:26:49Z (17 years ago)
From
Eli Rykoff at U of Michigan/ROTSE <erykoff@umich.edu>
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E. S. Rykoff, F. Yuan, S. A. Yost (U. Mich), report on behalf of the
ROTSE collaboration:
ROTSE-IIIc, located at the H.E.S.S. site at Mt. Gamsberg, Namibia,
responded to GRB 070611 (Swift trigger 282003; Stroh et al.,
GCN 6494), producing images beginning 7.6 s after the GCN notice time,
as reported in GCN 6495 (Schaefer, et al.). These unfiltered images are
calibrated relative to USNO-B1.0 (R).
Further analysis reveals a faint, late-rising counterpart at a position
consistent with the XRT position reported in GCN 6496 (Stroh, et al.).
At a midpoint of 2157 s after the burst (in a 600 s stacked image), the
counterpart was at a peak magnitude of 18.4+/-0.1 at a position:
00:07:58.0 -29:45:19.4 (J2000) [uncertainty < 1"]
The counterpart then faded below 19th magnitude by 6000 s post-burst.
A jpeg image is available at
http://www.rotse.net/images/gsb282003_3c041-050_key.jpg
Note that the object marked 156 is the candidate in question.
