TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2889 SUBJECT: Deep RAPTOR observations during GRB 041219 DATE: 04/12/20 20:11:31 GMT FROM: James Wren at LANL J. Wren, W. T. Vestrand, S. Evans, R. White, and P. Wozniak report on behalf of the RAPTOR team at Los Alamos National Lab. The RAPTOR-S telescope responded robotically to INTEGRAL trigger #2073. Our first image began at 01:44:13.65 UT, 8 seconds after receipt of the Integral notice and while the GRB was still ongoing. Summing our images over the duration of the GRB emission (1:44 UT to 1:52 UT), we marginally detect a possible source very close to our threshold at the location of the candidate given by Blake and Bloom (GCN 2870). Interpreted as an upper limit, these observations indicate the prompt optical emission remained fainter than R=19.4. A RAPTOR finder chart can be found at http://www.raptor.lanl.gov/grb041219/.