First year results from LOTIS Page: 3 of 8
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First Year Results from LOTIS
G. G. Williams1, H. S. Park2, E. Ables2, D. L. Banda,
S. D. Barthelmy4'5, R. Bionta2, P. S. Butterworth4,
T. L. Cline4, D. H. Ferguson6, G. J. Fishman7, N. Gehrels4,
D. H. Hartmann', K. Hurley8, C. Kouveliotou7,
C. A. Meegan7, L. Ott2, E. Parker2, and R. Wurtz2
1Dept. of Physics and Astronomy, Clemson University, Clemson, SC 29634-1911
2Lawrence Livermore National Laboratory, Livermore, CA 94550
3CASS 0424, University of California, San Diego, La Jolla, CA 92093
4 NASA/Goddard Space Flight Center, Greenbelt, MD 20771
sUniversities Space Research Association
6Dept. of Physics, California State University at Hayward, Hayward, CA 94542
7NASA/Marshall Space Flight Center, Huntsville, AL 35812
sSpace Sciences Laboratory, University of California, Berkeley, CA 94720-7450
Abstract. LOTIS (Livermore Optical Transient Imaging System) is a gamma-
ray burst optical counterpart search experiment located near Lawrence Livermore
National Laboratory in California. The system is linked to the GCN (GRB
Coordinates Network) real-time coordinate distribution network and can respond
to a burst trigger in 6-15 seconds. LOTIS has a total field-of-view of 17.40 x
17.4* with a completeness sensitivity of mv ~ 11 for a 10 second integration
time. Since operations began in October 1996, LOTIS has responded to over 30
GCN/BATSE GRlB triggers. Seven of these triggers are considered good events
subject to the criteria of clear weather conditions, < 60 s response time, and
> 50% coverage of the final BATSE 3- error circle. We discuss results from the
first year of LOTIS operations with an emphasis on the observations and analysis
of GR.B 971006 (BATSE trigger 6414).
Our knowledge of the nature of gamma-ray bursts (GRBs) has greatly in-
creased as a result of recent detections of X-ray, optical, and radio coun-
terparts. X-ray observations of several GRBs including but not limited
to GRB 970228 and GRB 970508 by BeppoSax [1,2] and GRB 970828 by
XTE/ASCA  have provided precise localizations which have allowed for deep
optical follow-up searches. These searches have resulted in the identification
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Williams, G.G.; Parks, H.S. & Ables, E. First year results from LOTIS, article, November 17, 1997; California. (digital.library.unt.edu/ark:/67531/metadc711999/m1/3/: accessed January 22, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.