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H. S. Park, R. Porrata, R. Bionta, E. Ables (LLNL), G. Williams, D. Hartmann (Clemson University), S. Barthelmy, N. Gehrels, T. Cline (NASA/GSFC), C. Kouveliotou, G. Fishman, C. Meegan (NASA/MSFC), D. Band (U.C., San Diego), K. Hurley (U.C., Berkeley), D. Ferguson (CalState, Hayward), R. Nemiroff (Michigan Technology University), LOTIS Collaboration
LOTIS is an automated wide-field-of-view telescope system that is capable of responding to GRB events within 10 s after a burst trigger from the GCN (coordinated from Beppo/SAX, BATSE and RXTE). Measurements of optical activity at these early times will provide important clues to the GRB production mechanism. Over a year's operation, LOTIS has responded to 40 GCN triggers including GRB970223, GRB971217, GRB981006 and GRB990129 within 10 s. This paper will report results from the LOTIS-covered events including constraints on the simultaneous optical signals from these GRBs. We will compare our results with the recent early optical observation of GRB990123. We will also present the status of the Super-LOTIS which will observe GRB field within 1 minute with mV~19 sensitivity level.
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