Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 7374

GRB 080307: Early RAPTOR Limits
2008-03-07T18:59:18Z (16 years ago)
James Wren at LANL <>
J. Wren, W.T. Vestrand, P.R. Wozniak, H. Davis
of Los Alamos National Laboratory report:

Our Raptor telescopes responded to Swift trigger 305011
(Holland et al., GCN 7362) at 11:24:30.8 UTC, 60.0 seconds
after the trigger and 7.3 seconds after receipt of the GCN
packet.  We detect no new optical source at the Swift XRT
position.  Five sigma limiting magnitudes are given for
three of our unfiltered response images in the table below.
Calibration was performed using the USNO B1.0 R-band

T-start (UTC)           T-exp (s)    mag limit
2008-03-07 11:24:30.81    5            16.9
2008-03-07 11:25:53.96    10           17.3
2008-03-07 11:30:12.01    30           18.0
Looking for U.S. government information and services? Visit