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GCN Circular 8228

Subject
GRB 080915: ROTSE-III Optical Limits
Date
2008-09-15T00:45:01Z (16 years ago)
From
Wiphu Rujopakarn at U AZ/Steward <wiphu@as.arizona.edu>
W. Rujopakarn (Steward), H. Swan (U Mich), T. Guver (U Arizona) report on
behalf of the ROTSE collaboration:

ROTSE-IIIc, located at the H.E.S.S. site at Mt. Gamsberg, Namibia,
responded to GRB 080915 (Swift trigger 324744; Oates et al., GCN 8227),
producing images beginning 11.2 s after the GCN notice time. An automated
response took the first image at 00:03:42.2 UT, 52.2 s after the burst,
under cloudy conditions. These observations were affected by the full
moon. We took 10 5-sec, and 1 20-sec exposures. These unfiltered images
are calibrated relative to USNO A2.0 (R). Imaging is on going.

Comparison to the DSS (second epoch) reveals no new sources within the
3-sigma Swift/BAT error circle. Individual images have limiting magnitudes
ranging from 14.0-14.3; we set the following specific limit.

start UT       end UT      t_exp(s)   mlim   t_start-tGRB(s)  Coadd?
--------------------------------------------------------------------
00:03:42.2   00:03:47.2         5     14.2           52.2       N
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