TITLE: GCN CIRCULAR
NUMBER: 6324
SUBJECT: GRB 070419A: RAPTOR Detection of Early Emission
DATE: 07/04/19 23:42:20 GMT
FROM: James Wren at LANL <jwren@nis.lanl.gov>
J. Wren, W.T. Vestrand, P.R. Wozniak, R. White, J. Pergande of Los Alamos
National Laboratory report:
Our Raptor telescopes responded to Swift trigger 276205 (Stamatikos et al., GCN
6302) at 10:00:49.8 UT, 83.7 s after the trigger and 7.8 s after receiving the
GCN packet. We detect optical emission from the counterpart reported by the KAIT
team (Chornock et al., GCN 6304). Our observations show that the counterpart
brightened from below magnitude 18.8 to 18.44 (+- .15) at a mid-exposure time of
10:09:27.9 UT (60s duration). The counterpart then began a slow decline but
remained detectable in our images until we interrupted our observing sequence at
10:47:17 UT for Swift trigger 276212. Our unfiltered images were calibrated
using the R-band magnitudes from the USNO B1.0 catalog.
This information is also being transmitted via VOEvent on the VOEventNet.
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