GCN Circular 9624
Subject
GRB 090708: Early RAPTOR Optical Limits
Date
2009-07-08T20:31:21Z (15 years ago)
From
James Wren at LANL <jwren@nis.lanl.gov>
J. Wren, W.T. Vestrand, P.R. Wozniak, H. Davis, B. Norman
of Los Alamos National Laboratory report:
The RAPTOR telescope system responded to Swift trigger
356776 (Krimm et al., GCN 9621) under good observing conditions.
A nearly full moon was above the horizon at the time of the
observations, limiting sensitivity. Our narrow-field instruments
began observing the location at 03:39:05.87 UTC, 50.62 s after
the Swift trigger (6.9 s after receipt of GCN message). The data
from our R-band filtered system was calibrated to the USNO-B1
catalog. These data show no new source within the BAT error
circle (Palmer et al., GCN 9623) when compared to the DSS. We
can put the following R-band (Cousins) limits on the emission:
t-mid(s) exp(s) mag mag-err
[since trigger]
----------------------------------------------------
61.59 5.0 16.2 3 sigma limit
101.85 30.0 17.3 3 sigma limit