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Astron. Astrophys. Suppl. Ser. 138, 577-578

LOTIS: GRB follow-up observations at early times

H.S. Park1 - R.A. Porrata1 - G.G. Williams2 - E. Ables1 - D.L. Band5 - S.D. Barthelmy3,7 - R.M. Bionta1 - T.L. Cline3 - G.J. Fishman4 - N. Gehrels3 - D. Hartmann2 - K. Hurley6 - C. Kouveliotou4,7 - C.A. Meegan4

Send offprint request: H.S. Park,

1 - Lawrence Livermore National Laboratory, Livermore, CA 94550, U.S.A.
2 - Dept. of Physics and Astronomy, Clemson University, Clemson, SC 29634, U.S.A.
3 - NASA Goddard Space Flight Center, Greenbelt, MD 20771, U.S.A.
4 - NASA Marshall Space Flight Center, Huntsville, AL 35812, U.S.A.
5 - CASS 0424, University of California, San Diego, La Jolla, CA 92093, U.S.A.
6 - Space Science Laboratory, University of California, Berkeley, CA 94720, U.S.A.
7 - Unversity Space Research Association, U.S.A.

Received December 29, 1998; accepted March 23, 1999


LOTIS is an automated wide field-of-view telescope system capable of responding to GRB events as early as 10 s after a trigger from the GCN which rapidly distributes coordinates from the BeppoSAX, BATSE and RXTE instruments. Measurements of optical activity at these early times will provide important clues to the GRB production mechanism. In over two year's of operation, LOTIS has responded to 40 GCN triggers including GRB 971227 within 10 s and GRB 980703 within 5 hours. We report results from these events and constraints on simultaneous optical signals during these GRBs.

Key words: gamma-rays: bursts

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