[vsnet-grb-info 5827] GRB 080319C: Early RAPTOR Observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  7477
SUBJECT: GRB 080319C: Early RAPTOR Observations
DATE:    08/03/20 06:07:34 GMT
FROM:    James Wren at LANL  <jwren at 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