TITLE: GCN CIRCULAR NUMBER: 11730 SUBJECT: GRB110213A: RAPTOR Early Optical Peak and Plateau Measurements DATE: 11/02/14 23:04:03 GMT FROM: James Wren at LANL J. Wren, W.T. Vestrand, P.R. Wozniak, H. Davis, of Los Alamos National Laboratory report: The RAPTOR telescope system responded to Swift trigger 445414 (V. D'Elia et al., GCN 11705) under fair observing conditions. Our narrow-field instruments began observing the location at 05:17:58.2 UTC, 28.7 seconds after the initial BAT trigger. We detect the optical counterpart at the location reported by the Swift UVOT team. The counterpart brightens from below our threshold at around 100 seconds after the BAT trigger. It reaches a peak magnitude of 14.7 at T~300 s. The counterpart then begins a steady decline to magnitude 16.0 at T~2000 s. At that point, the counterpart re-brightens to a plateau at roughly magnitude 15.8 for about an hour before resuming the fading behavior. The following table gives a sample of our observations: t-mid(s) exp(s) mag mag-err -------------------------------------------- 143.80 10.0 15.23 0.03 352.60 10.0 14.68 0.02 2179.60 30.0 16.12 0.03 4522.90 30.0 15.58 0.03 7172.30 30.0 16.00 0.04 The unfiltered images were calibrated against the USNO-B1 R-band.