GCN Circular 7477
Subject
GRB 080319C: Early RAPTOR Observations
Event
Date
2008-03-20T06:07:34Z (18 years ago)
From
James Wren at LANL <jwren@nis.lanl.gov>
J. Wren, W.T. Vestrand, P.R. Wozniak, H. Davis
of Los Alamos National Laboratory report:
Our RAPTOR telescopes responded to Swift trigger 306778
(Pagani et al., GCN 7442) at 12:26:30.66 UTC, 33.70 seconds
after the trigger. We detect the optical counterpart
initially reported by Li (GCN 7441). Our measurements are
consistent with those reported by KAIT (GCN 7441 and 7475)
and Super-LOTIS (7443). Our images became dominated by the
morning twilight at about 12:35 UTC. The unfiltered
measurements reported in the following table are calibrated
to the USNO-B1 R band.
t-mid(s) exp(s) mag mag-err
-----------------------------------------
47.60 5.0 16.97 0.32
85.27 80.3 17.65 0.18
177.36 61.5 18.22 0.36
228.87 61.1 17.32 0.16
293.28 61.7 17.41 0.20
358.12 62.1 17.13 0.16