GCN Circular 7928
Subject
GRB 080701A: Early RAPTOR optical limits
Event
Date
2008-07-02T23:24:50Z (17 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
315615 (Stroh et al., GCN 7910) under good observing conditions.
Our narrow-field instruments began observing the location at
10:14:06.47 UTC, 28.8 s after the Swift trigger. We detect no
counterpart at the improved XRT position (Evans et al., GCN 7914).
The limiting magnitudes of our unfiltered observations when
calibrated to the USNO-B1 R-band are given in the following table.
The GRB location was also within the field of view of our
continuous all-sky monitoring system. We can place 3 sigma limits
at or below magnitude 9.4 during the time period within 2
minutes both before and after the trigger.
t-mid(s) exp(s) mag mag-err
--------------------------------------------
-11.68 10.0 9.7 3 sigma limit
11.57 10.0 10.0 3 sigma limit
34.80 10.0 9.9 3 sigma limit
71.45 45.0 19.3 3 sigma limit
173.93 100.0 19.8 3 sigma limit
300.65 100.0 19.9 3 sigma limit
561.10 270.0 20.5 3 sigma limit